COIN-OR::LEMON - Graph Library

source: lemon-project-template-glpk/deps/glpk/ChangeLog @ 10:5545663ca997

subpack-glpk
Last change on this file since 10:5545663ca997 was 9:33de93886c88, checked in by Alpar Juttner <alpar@…>, 13 years ago

Import GLPK 4.47

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1Fri Sep 09 12:00:00 2011 Andrew Makhorin <mao@gnu.org>
2
3        * GLPK 4.47 (32:0:32) has been released
4
5        * src/glpapi20.c
6        New API routine glp_infeas1 to solve 0-1 feasibility problem
7        was added and documented (see doc/cnfsat.pdf).
8
9        * src/glpnpp06.c
10        Some new preprocessor routines for SAT-CNF encoding, which are
11        used by the routine glp_intfeas1, were added.
12
13        * src/glpnpp.h
14        The header was modified due to additions.
15
16        * src/glpapi21.c
17        The glpsol solver was modified to bypass model postprocessing
18        if the solution reported is neither optimal nor feasible.
19
20        * src/glpapi21.c
21        New glpsol options (--minisat and --objbnd) were added.
22
23        * examples/pbn/*.*
24        The paint-by-numbers puzzle model (pbn.mod) was modified to
25        print solution in PostScript format and to check for multiple
26        solutions. Some benchmark examples from <webpbn.com> encoded
27        in MathProg were included in the distribution. For more details
28        see examples/pbn/README and examples/pbn/pbn.pdf.
29
30        * examples/Makefile.am
31        A minor bug was fixed to correctly build glpk in a separate
32        directory. Thanks to Marco Atzeri <marco.atzeri@gmail.com> for
33        bug report.
34
35Tue Aug 09 12:00:00 2011 Andrew Makhorin <mao@gnu.org>
36
37        * GLPK 4.46 (31:0:31) has been released
38
39        * src/glpk.h, src/Makefile
40        glpk.h was relocated from 'include' to 'src', and 'include'
41        subdir was removed; src/Makefile.am was changed appropriately.
42
43        * src/zlib/*.*
44        zlib general purpose compression library, version 1.2.5,
45        was ANSIfied and modified according to GLPK requirements and
46        included in the distribution as an external software module.
47
48        For details see src/zlib/README.
49
50        * src/glpdmx.c
51        The following new API routines were added:
52        glp_read_cnfsat  - read CNF-SAT problem data in DIMACS format
53        glp_check_cnfsat - check for CNF-SAT problem instance
54        glp_write_cnfsat - write CNF-SAT problem data in DIMACS format
55
56        * src/minisat/*.*
57        MiniSat, a CNF-SAT solver, version 1.14.1, was ANSIfied and
58        modified according to GLPK requirements and included in the
59        distribution as an external software module.
60
61        For details see minisat/README and minisat/LICENSE.
62
63        * src/glpapi19.c
64        The API routine glp_minisat1, which is a driver to the MiniSat
65        solver, was included in the package.
66
67        * doc/satcnf.*
68        The document "CNF Satisfiability Problem" was included in the
69        package. It is a supplement to the GLPK Reference Manual.
70
71        * src/glpapi20.c
72        New glpsol options (--cnf, --wcnf, and --minisat) was added.
73
74        * glpsql.c
75        Some bugs were fixed. Thanks to Xypron <xypron.glpk@gmx.de>.
76
77Sun Dec 05 12:00:00 2010 Andrew Makhorin <mao@gnu.org>
78
79        * GLPK 4.45 (30:0:30) has been released
80
81        * glplpx01.c
82        A bug (it_cnt) in routine reset_parms was fixed.
83        Thanks to Ali Baharev <ali.baharev@gmail.com> for report.
84
85        * glpmpl03.c
86        A bug (print "text\") was fixed.
87        Thanks to Xypron <xypron.glpk@gmx.de> for report.
88
89        * glpsql.c
90        A precision bug was fixed.
91        Thanks to Xypron <xypron.glpk@gmx.de>.
92
93        * glpk.tex
94        Some typos were corrected.
95        Thanks to Robbie Morrison <robbie@actrix.co.nz>.
96
97Thu Jun 03 12:00:00 2010 Andrew Makhorin <mao@gnu.org>
98
99        * GLPK 4.44 (29:0:29) has been released
100
101        * glpapi14.c glpmpl.h glpmpl01.c glpmpl03.c glpmpl04.c
102        Implemented suffixes for variables and constraints.
103
104        * glpmpl06.c
105        Made changes to allow comment records in CSV files.
106
107        * glpapi17.c
108        Added and documented new API routine glp_cpp to solve Critical
109        Path Problem.
110
111Sat Feb 20 12:00:00 2010 Andrew Makhorin <mao@gnu.org>
112
113        * GLPK 4.43 (28:0:28) has been released
114
115        * glplib.h, glplib.c, glpenv.h, glpenv.c
116        The module glpenv was split into two modules glpenv and glplib.
117
118        * glpenv01.c, glpenv03.c, glpenv04.c, glpenv06.c
119        The following new API routines were added and documented:
120        glp_init_env, glp_free_env, glp_open_tee, glp_close_tee,
121        glp_error (macro), glp_difftime.
122
123        * glpapi16.c
124        New API routine glp_top_sort (topological sorting of ayclic
125        digraph) was added and documented.
126
127        * glpapi17.c
128        A serious bug was fixed in the routine glp_asn_prob_hall.
129
130        * glpnpp05.c
131        A bug was fixed in the LP/MIP preprocessor (hidden covering
132        inequalities).
133
134        * glpsql.c
135        Some improvements were made in the table driver (NULL data).
136        Thanks to Xypron <xypron.glpk@gmx.de> for contribution.
137
138        * configure.ac
139        Changes were made to use .dylib rather than .so under Mac OS.
140        Thanks to Noli Sicad <nsicad@gmail.com> for testing
141
142Wed Jan 13 12:00:00 2010 Andrew Makhorin <mao@gnu.org>
143
144        * GLPK 4.42 (27:0:27) has been released
145
146        * glpapi01.c, glpapi11.c, glpapi12.c, glpdmx.c
147        The following new API routines were added and documented:
148        glp_check_dup (check for duplicate elements in sparse matrix);
149        glp_sort_matrix (sort elements of the constraint matrix);
150        glp_read_prob (read problem data in GLPK format);
151        glp_write_prob (write problem data in GLPK format);
152        glp_analyze_bound (analyze active bound of non-basic variable);
153        glp_analyze_coef (analyze obj. coefficient at basic variable);
154        glp_print_ranges (print sensitivity analysis report; replaces
155        lpx_print_sens_bnds).
156
157        * glpapi20.c
158        New command-line options were added to glpsol:
159        --glp (read problem data in GLPK format);
160        --wglp (write problem data in GLPK format);
161        --lp (replaces --cpxlp);
162        --wlp (replaces --wcpxlp);
163        --ranges (print sensitivity analysis report).
164
165        * glpapi06.c
166        In the routine glp_init_smcp default value of the parameter
167        out_frq was changed to 500 (it was 200).
168
169        * glpipp.h, glpipp01.c, glpipp02.c
170        The old MIP preprocessor module was removed.
171
172        * glpapi09.c
173        Now the MIP solver uses the new MIP preprocessor (NPP).
174
175        * glplpx03.c
176        lpx_write_opb was disabled due to replacing IPP with NPP.
177
178        * glpnet09.c
179        Kellerman's heuristic to cover edges by cliques was added.
180
181        * glplib08.c
182        Recognition of special filenames "/dev/stdin", "/dev/stdout",
183        and "/dev/stderr" was added.
184
185        * glpk.tex
186        Chapter "Graph and network routines" was carried out from the
187        reference manual as a separate document.
188
189Mon Dec 21 12:00:00 2009 Andrew Makhorin <mao@gnu.org>
190
191        * GLPK 4.41 (26:0:26) has been released
192
193        * glpapi12.c
194        The following new API routines were added:
195        glp_transform_row (replaces lpx_transform_row);
196        glp_transform_col (replaces lpx_transform_col);
197        glp_prim_rtest (replaces lpx_prim_ratio_test);
198        glp_dual_rtest (replaces lpx_dual_ratio_test).
199        Note that values returned by glp_prim_rtest and glp_dual_rtest
200        differ from the ones retutned by the deprecated routines.
201
202        * glpnpp*.*
203        The LP/MIP preprocessor was essentially re-implemented.
204
205        * glpios03.c
206        The feature to remove inactive cuts from the active subproblem
207        was implemented.
208
209        * glpios11.c
210        The feature processing cuts stored in the cut pool was improved
211        (now it uses estimation of objective degradation).
212
213        * glpscg.*
214        Obsolete implemetation of the conflict graph was removed.
215
216        * glpmpl.h, glpmpl03.c, glpmpl04.c
217        FILE was replaced by XFILE to allow using GLPK I/O routines.
218
219        * glpsql.c, examples/sql, doc/tables.tex
220        The SQL table driver was changed to allow multiple arguments
221        separated by semicolon in SQL statements. Thanks to Xypron
222        <xypron.glpk@gmx.de>.
223
224        * glpk.h, glpapi14.c
225        New API routine glp_time was added (not documented yet).
226
227        * glpapi20.c
228        Two new options were added to glpsol: --seed value (initialize
229        pseudo-random number generator used in MathProg model with
230        specified seed value), and --ini filename (use as initial basis
231        previously saved with -w option).
232
233        * examples/xyacfs.mod
234        Thanks to Nigel Galloway <nigel_galloway@operamail.com> for
235        contribution.
236
237        * examples/dbf/*.*
238        Thanks to Noli Sicad <nsicad@gmail.com> for contribution.
239
240        * w32/*.*, w64/*.*
241        Scripts to build GLPK with Microsoft Visual Studio 2010 were
242        added. Thanks to Xypron <xypron.glpk@gmx.de> for contribution
243        and testing.
244
245Tue Nov 03 12:00:00 2009 Andrew Makhorin <mao@gnu.org>
246
247        * GLPK 4.40 (25:0:25) has been released
248
249        * glpdmx.c
250        Two new API routines were added:
251        glp_read_ccdata (read graph in DIMACS clique/coloring format);
252        glp_write_ccdata (write graph in DIMACS clique/coloring format).
253        Also an example file examples/sample.col was added.
254
255        * glpapi19.c, glpnet08.c
256        New API routine glp_wclique_exact was added. It is intended to
257        find a maximum weight clique with the exact algorithm developed
258        by Prof. P. Ostergard.
259
260        * glpnpp02.c
261        A bug was fixed in the LP preprocessor (routine npp_empty_col).
262        Thanks to Stefan Vigerske <stefan@math.hu-berlin.de> for the
263        bug report.
264
265        * glpios10.c
266        A bug was fixed and some improvements were made in the FPUMP
267        heuristic module. Thanks to Xypron <xypron.glpk@gmx.de>.
268
269        * glpapi12.c
270        A bug was fixed in the API routine glp_warm_up (dual
271        feasibility test was incorrect in maximization case). Thanks to
272        Uday Venkatadri <Uday.Venkatadri@dal.ca> for the bug report.
273
274        * glpapi16.c
275        Two new API routines were added:
276        glp_del_vertices (remove vertices from graph);
277        glp_del_arc (remove arc from graph).
278
279        * glpios09.c
280        The hybrid pseudocost branching heuristic was included in the
281        MIP solver. It is available on API level (iocp.br_tech should
282        be set to GLP_BR_PCH) and in the stand-alone solver glpsol
283        (via the command-line option --pcost). This heuristic may be
284        useful on solving hard MIP instances.
285
286        * glpios03.c
287        The branching heuristic by Driebeck and Tomlin (used in the
288        MIP solver by default) was changed to switch to branching on
289        most fractional variable if an lower bound of degradation of
290        the objective is close to zero for all branching candidates.
291
292Sun Jul 26 12:00:00 2009 Andrew Makhorin <mao@mai2.rcnet.ru>
293
294        * GLPK 4.39 (24:0:24) has been released
295
296        * glpsdf.c
297        New API routines to read plain data files were added.
298
299        * glpcpx.h, glpini.h, glpscl.h
300        These headers were removed.
301
302        * glpcpx.c
303        API routines glp_read_lp and glp_write_lp to read/write files
304        in CPLEX LP format were re-implemented. Now glp_write_lp
305        correctly writes double-bounded (ranged) rows by introducing
306        slack variables rather than by duplicating the rows. The data
307        structure glp_cpxcp and routine glp_init_cpxcp were added.
308
309        * amd/*
310        The 'xfree(NULL)' bug was fixed in the AMD routines. Thanks to
311        Niels Klitgord <niels@bu.edu> for the bug report.
312
313        * glpapi16.c
314        New API routines glp_set_vertex_name, glp_create_v_index,
315        glp_find_vertex, and glp_delete_v_index were added.
316
317        * glpdmx.c
318        New API routines glp_read_asnprob, glp_write_asnprob,
319        glp_read_ccformat, and glp_write_ccformat were added (the two
320        latter routines are not documented yet).
321
322        * glpapi18.c
323        New API routines glp_check_asnprob, glp_asnprob_lp,
324        glp_asnprob_okalg, and glp_asnprob_hall were added.
325
326        * glpini01.c, glpini02.c
327        The message "Crashing..." was changed to "Constructing initial
328        basis..." due to suggestion by Thomas Kahle <tom111@gmx.de>.
329
330        * glpapi14.c
331        New API routines glp_printf, glp_vprintf, glp_malloc,
332        glp_calloc, glp_free, and glp_assert were added.
333
334        * glplpp.h, glplpp01.c, glplpp02.c
335        Old LP presolver routines were removed. Now glp_simplex uses
336        new preprocessing routines (see glpnpp).
337
338        * glpapi12.c
339        New API routine glp_warm_up was added; it replaces the routine
340        lpx_warm_up.
341
342Sat May 02 12:00:00 2009 Andrew Makhorin <mao@mai2.rcnet.ru>
343
344        * GLPK 4.38 (23:0:23) has been released
345
346        * glpmps.c
347        API routines to read/write MPS files were re-implemented.
348
349        * glpspx02.c
350        Some improvements were made in the dual simplex routine.
351
352        * glpk.h
353        New structure glp_iptcp was added.
354
355        * glpnpp.h, glpnpp01.c, glpnpp02.c
356        New LP/MIP preprocessor. Currently it includes only some basic
357        routines and used only in the interior-point solver.
358
359        * glpapi08.c
360        API routine glp_interior was replaced by an improved version
361        (new LP/MIP preprocessor, new ordering algorithms).
362
363        New API routine glp_init_iptcp was added.
364
365        API routine glp_ipt_status may return two new statuses due to
366        changes in glp_interior.
367
368        * glpsol.c
369        New command-line options were added (ordering algorithm used in
370        the interior-point solver).
371
372        * amd/*.*, colamd/*.*
373        Two external software modules AMD and COLAMD/SYMAMD used in the
374        interior-point solver were included in the distribution.
375
376        For details see amd/README and colamd/README.
377
378        * glpnet03.c, glpnet04.c, glpnet05.c
379        A minor bug was fixed (_G => G_). Thanks to Nelson H. F. Beebe
380        <beebe@math.utah.edu> for bug report.
381
382Sun Mar 29 12:00:00 2009 Andrew Makhorin <mao@mai2.rcnet.ru>
383
384        * GLPK 4.37 (22:0:22) has been released
385
386        * glpk.h
387        iocp.fp_heur was added to enable/disable fpump heuristic.
388
389        * glpios10.c
390        ios_feas_pump was added (feasibility pump heuristic).
391
392        * glpsol.c
393        --fpump command-line option was added.
394
395        * glpsds.c
396        Plain data set routines were added to facilitate reading plain
397        data in application programs. Currently these routines are not
398        in API, though declared in glpk.h.
399
400        * glpapi08.c
401        A bug was fixed in the internal routine restore. (Due to this
402        bug dual solution components were computed incorrectly if the
403        problem was scaled.)
404
405        * glpapi10.c, glpapi11.c
406        The following new API routines were added:
407        glp_print_sol (replaces lpx_print_sol);
408        glp_print_ipt (replaces lpx_print_ips);
409        glp_print_mip (replaces lpx_print_mip);
410        _glp_check_kkt (replaces lpx_check_kkt, lpx_check_int).
411        Now the routine lpx_print_prob (deprecated) is equivalent to
412        the routine glp_write_lp.
413
414        * glpapi18.c, glpapi19.c
415        The following new API routines were added:
416        glp_read_graph (read graph from plain text file);
417        glp_write_graph (write graph to plain text file);
418        glp_weak_comp (find all weakly connected components);
419        glp_strong_comp (find all strongly connected components).
420
421        * configure.ac, Makefile.am
422        Changes were made: (a) to allow using autoreconf/autoheader;
423        (b) to allow building glpk in a directory other than its source
424        directory. Thanks to Marco Atzeri <marco_atzeri@yahoo.it> for
425        bug report.
426
427        * examples/shiftcover.mod
428        An example model in MathProg was added.
429        Thanks to Larry D'Agostino <Larry.D'Agostino@gmacrescap.com>
430        for contribution.
431
432Fri Feb 06 12:00:00 2009 Andrew Makhorin <mao@mai2.rcnet.ru>
433
434        * GLPK 4.36 (21:0:21) has been released
435
436        * glpnet06.c, glpnet07.c, glpapi19.c
437        The following new API routines were added:
438        glp_mincost_okalg     find minimum-cost flow with out-of-kilter
439                              algorithm
440        glp_maxflow_ffalg     find maximal flow with Ford-Fulkerson
441                              algorithm
442
443        * glpsol.c
444        Two new command-line options were added:
445        --mincost             read min-cost flow data in DIMACS format
446        --maxflow             read maximum flow data in DIMACS format
447
448        * doc/glpk.*
449        New edition of the reference manual was included.
450
451        * glpk.h
452        Duplicate symbols were removed to allow using swig.
453        Thanks to Kelly Westbrooks <kellywestbrooks@yahoo.com> and
454        Nigel Galloway <nigel_galloway@operamail.com> for suggestion.
455
456        * glpcpx.c
457        A minor defect was fixed in the routine glp_write_lp.
458        Thanks to Sebastien Briais <sbriais@free.fr> for bug report.
459
460        * glpsql.c
461        A minor bug was fixed. Thanks to Xypron <xypron.glpk@gmx.de>
462        for patch.
463
464        * examples/hashi.mod, examples/shikaku.mod
465        Two example models in MathProg were added. Thanks to Sebastian
466        Nowozin <nowozin@gmail.com> for contribution.
467
468        * examples/qfit.mod, examples/yacfs.mod
469        Two example models in MathProg were added. Thanks to Nigel
470        Galloway <nigel_galloway@operamail.com> for contribution.
471
472Fri Jan 09 12:00:00 2009 Andrew Makhorin <mao@mai2.rcnet.ru>
473
474        * GLPK 4.35 (20:0:20) has been released
475
476        * glpk.h, glpapi.c, glpnet.c
477        The following new API routines were added:
478        glp_create_graph      create graph
479        glp_set_graph_name    assign (change) graph name
480        glp_add_vertices      add new vertices to graph
481        glp_add_arc           add new arc to graph
482        glp_erase_graph       erase graph content
483        glp_delete_graph      delete graph
484        glp_read_mincost      read minimum cost flow problem data in
485                              DIMACS format
486        glp_write_mincost     write minimum cost flow problem data in
487                              DIMACS format
488        glp_mincost_lp        convert minimum cost flow problem to LP
489        glp_netgen            Klingman's network problem generator
490        glp_gridgen           grid-like network problem generator
491        glp_read_maxflow      read maximum flow problem data in DIMACS
492                              format
493        glp_write_maxflow     write maximum flow problem data in DIMACS
494                              format
495        glp_maxflow_lp        convert maximum flow problem to LP
496        glp_rmfgen            Goldfarb's maximum flow problem generator
497
498        * doc/glpk.*
499        New edition of the reference manual was included.
500
501        * examples/sample.min, examples/sample.max
502        Two example data files in DIMACS format were added.
503
504        * glplib04.c
505        The statement "if (c = '\n') fflush(stdout)" was added to the
506        internal routine xputc to provide "real-time" terminal output.
507        Thanks to Luiz Bettoni <bettoni@cpgei.ct.utfpr.edu.br> for
508        suggestion.
509
510        * glpmpl05.c
511        A minor bug was fixed in the internal routine mpl_fn_time2str.
512        Thanks to Stefan Vigerske <stefan@vigerske.de> for bug report.
513
514        * w32/makefile, w64/makefile
515        The flag -O2 (/O2) was added to some makefiles.
516
517Thu Dec 04 12:00:00 2008 Andrew Makhorin <mao@mai2.rcnet.ru>
518
519        * GLPK 4.34 (19:0:19) has been released
520
521        * src/glpios03.c
522        A bug was fixed in the internal routine branch_on. Thanks to
523        Nigel Galloway <nigel_galloway@operamail.com> for bug report.
524
525        * src/glpmpl05.c
526        Three new MathProg functions were included:
527        gmtime    obtaining current calendar time
528        str2time  converting character string to calendar time
529        time2str  converting calendar time to character string
530        Thanks to Xypron <xypron.glpk@gmx.de>.
531
532        * doc/glpk.*, doc/gmpl.*
533        A new edition of the GLPK reference manual and GNU MathProg
534        language description were included.
535
536Thu Oct 30 12:00:00 2008 Andrew Makhorin <mao@mai2.rcnet.ru>
537
538        * GLPK 4.33 (18:0:18) has been released
539
540        * glpapi*.*
541        The following new API routines were added:
542        glp_copy_prob         copy problem object content
543        glp_exact             solve LP in exact arithmetic
544                              (makes lpx_exact deprecated)
545        glp_get_unbnd_ray     determine variable causing unboundedness
546                              (makes lpx_get_ray_info deprecated)
547        glp_interior          solve LP with interior-point method
548                              (makes lpx_interior deprecated)
549
550        * glpapi*.*
551        The following new API routines for processing models written in
552        the GNU Mathprog language were added to the package:
553        glp_mpl_alloc_wksp    allocate the translator workspace
554        glp_mpl_read_model    read and translate model section
555        glp_mpl_read_data     read and translate data section
556        glp_mpl_generate      generate the model
557        glp_mpl_build_prob    build LP/MIP instance from the model
558        glp_mpl_postsolve     postsolve the model
559        glp_mpl_free_wksp     deallocate the translator workspace
560        (These routines make lpx_read_model deprecated.)
561
562        * src/glpapi17.c, examples/glpsol.c
563        The stand-alone solver glpsol was re-implemented with new API
564        routines.
565
566        * src/glpsql.c
567        Some bugs were fixed in the SQL table driver. Thanks to Xypron
568        <xypron.glpk@gmx.de>.
569
570        * examples/cplex/*.*
571        A crude implementation of CPLEX-like interface to GLPK API was
572        added to the package. See examples/cplex/README.
573
574Fri Oct 03 12:00:00 2008 Andrew Makhorin <mao@mai2.rcnet.ru>
575
576        * GLPK 4.32 (17:0:17) has been released
577
578        * glpmpl01.c
579        A bug was fixed. Due to this bug iterated expressions having
580        an indexing expression whose dummy indices are bound to some
581        values, i.e. like sum{(i+1,j,k-1) in E} x[i,j,k] are evaluated
582        incorrectly. Namely, current value of such expressions is not
583        invalidated when corresponding dummy indices (like i and k in
584        the example above) are changed, that erroneously results in the
585        same value evaluated for the first time.
586
587        * glpios03.c
588        Euclidean reduction of the local objective bound was added in
589        the routine glpios03.c.
590
591        * glpapi11.c
592        The following new branch-and-cut API routines were added:
593        glp_ios_row_attr      determine additional row attributes;
594        glp_ios_pool_size     determine current size of the cut pool;
595        glp_ios_add_row       add constraint to the cut pool;
596        glp_ios_del_row       delete constraint from the cut pool;
597        glp_ios_clear_pool    delete all constraints from the cut pool.
598
599        * glpapi08.c
600        The following new features were included in the branch-and-cut
601        solver (the API routine glp_intopt):
602        MIP presolver;
603        mixed cover cut generator;
604        clique cut generator.
605        Due to the MIP presolver glp_intopt may additionally return
606        GLP_ENOPFS and GLP_ENODFS, if primal or dual infeasibility of
607        LP relaxation is detected by the presolver. Also the return
608        code GLP_EMIPGAP was introduced to correctly indicate that the
609        mip gap tolerance is reached.
610
611        * glplpx01.c
612        Now the obsolete API routines lpx_integer and lpx_intopt are
613        completely superseded by the API routine glp_intopt that makes
614        them deprecated.
615
616        * glpmpl05.c
617        Now the table driver name "iODBC" can be specified as "ODBC".
618
619        * glpmpl03.c
620        A bug fixed in the routine free_dca.
621        Thanks to Xypron <xypron.glpk@gmx.de>.
622
623        * glpsql.c
624        A bug was fixed in the SQL table driver.
625        Thanks to Xypron <xypron.glpk@gmx.de>.
626
627        * examples/glpsol.c
628        Changes were made to allow multiple MathProg data files.
629
630        * doc/glpk.*
631        A new edition of the GLPK reference manual was included.
632
633        * doc/tables.*
634        A new edition of the supplement "Using data tables in the GNU
635        MathProg language" was included.
636
637Tue Sep 02 12:00:00 2008 Andrew Makhorin <mao@mai2.rcnet.ru>
638
639        * GLPK 4.31 (16:0:16) has been released
640
641        * glpspx.h, glpspx01.c, glpspx02.c, glpapi06.c
642        The dual simplex solver (spx_dual_opt) was replaced by a new
643        implementation of the two-phase dual simplex method (spx_dual).
644        Old simplex method routines (spx_prim_opt, spx_prim_feas, and
645        spx_dual_opt) were removed from the package.
646
647        * glpk.h, glpscl.h, glpscl.c, glpapi04.c
648        New API routine glp_scale_prob was added. It replaces routine
649        lpx_scale_prob which is deprecated.
650
651        * glpk.h, glpini.h, glpini01.c, glpini02.c, glpapi05.c
652        New API routines glp_std_basis, glp_adv_basis, glp_cpx_basis
653        were added. They replace routines lpx_std_basis, lpx_adv_basis,
654        lpx_cpx_basis which are deprecated.
655
656        * glpdmp.c
657        8-byte data alignment was added to the module (sufficient for
658        both ILP32 and LP64 environments).
659
660        * glplib07.c
661        16-byte data alignment was added to the module to provide
662        compatibility with LP64 environment (8-byte is not sufficient
663        due to jmp_buf; thanks to Xypron for investigation).
664
665        * glplpx16.c
666        New version of the routine lpx_write_pb was added. Thanks to
667        Oscar Gustafsson <oscarg@isy.liu.se> for the contribution.
668
669        * w32/VC9, w64/VC9
670        Makefiles and batch files were added to build GLPK under 32-
671        and 64-bit Windows with Microsoft Visual Studio Express 2008.
672        Thanks to Heinrich Schuchardt <heinrich.schuchardt@gmx.de> for
673        the contribution and testing.
674
675        * w32/DM, w32/OWC
676        Makefiles and batch files were added to build GLPK with Digital
677        Mars C/C++ 8.50 and Open Watcom C/C++ 1.6 (32-bit Windows).
678
679Wed Aug 13 12:00:00 2008 Andrew Makhorin <mao@mai2.rcnet.ru>
680
681        * GLPK 4.30 (15:0:15) has been released
682
683        * glpspx.h, glpspx03.c, glpapi06.c
684        The primal simplex solver (spx_prim_opt, spx_prim_feas) was
685        replaced by a new implementation (spx_primal), which currently
686        provides the same features as the old version.
687
688        * glpmpl01.c, glpmpl03.c
689        Some changes were made in the MathProg translator to allow <,
690        <=, >=, and > on comparing symbolic values. Thanks to Heinrich
691        Schuchardt <heinrich.schuchardt@gmx.de> for patches.
692
693        * glplpx10.c
694        Internal routine set_d_eps in the exact LP solver was changed
695        to prevent approximation errors in case of integral data.
696        Thanks to Markus Pilz <pilz@cs.uni-bonn.de> for bug report.
697
698XXX XXX XX 12:00:00 2008 Andrew Makhorin <mao@mai2.rcnet.ru>
699
700        * GLPK 4.29 (14:0:14) has been released
701
702        * configure.ac
703        The configure script was changed to disable optional features
704        by default. For details see file INSTALL.
705
706        * glpipp02.c
707        A bug was fixed in the internal routine reduce_bounds. Thanks
708        to Anne-Laurence Putz <anne-laurence.putz@eurodecision.com> for
709        the bug report.
710
711        * glpapi01.c
712        New API routine glp_erase_prob was added.
713
714        * glpapi13.c
715        New API routines glp_read_mps and glp_write_mps were added.
716        They replace API routines lpx_read_mps, lpx_read_freemps,
717        lpx_write_mps, and lpx_write_freemps, which are deprecated.
718
719        * glpapi14.c
720        New API routines glp_read_lp and glp_write_lp were added. They
721        replace API routines lpx_read_cpxlp and lpx_write_cpxlp, which
722        are deprecated.
723
724        * glpsql.c
725        Minor bug was fixed. Thanks to Xypron <xypron.glpk@gmx.de> for
726        the bug report.
727
728Tue Mar 25 12:00:00 2008 Andrew Makhorin <mao@mai2.rcnet.ru>
729
730        * GLPK 4.28 (13:0:13) has been released
731
732        * glplib.h, glplib.c
733        Three wrapper routines xdlopen, xdlsym, and xdlclose, which
734        provide the shared library support, were added. A particular
735        version of these routines depends on the option --enable-dl
736        passed to the configure script (see file INSTALL for details).
737        Thanks to Rafael Laboissiere <rafael@debian.org> for useful
738        advices concerning the shared library support.
739
740        * glpsql.c
741        A static linking to iODBC and MySQL libraries used in the
742        MathProg table drivers was replaced by a dynamic linking to
743        corresponding shared libraries.
744        Many thanks to Heinrich Schuchardt <heinrich.schuchardt@gmx.de>
745        for the contribution and to Vijay Patil <vijay.patil@gmail.com>
746        for testing this feature under Windows XP.
747
748        * glpgmp.h, glpgmp.c
749        A bug (which appeared only on 64-bit platforms) was fixed.
750        Thanks to Axel Simon <Axel.Simon@ens.fr> for the bug report.
751
752        * glpapi.c
753        A bug was fixed in the api routine glp_add_cols. (If the basis
754        is valid, adding column keeps it valid, however, col->bind was
755        set to -1 rather to 0.)
756        Thanks to Cedric[FR] <fox2113@wanadoo.fr> for the bug report.
757
758        * glplib.c
759        64-bit unsigned int type glp_ulong and corresponding routines
760        were replaced by 64-bit signed int type xlong_t.
761
762        * glpk.h, glpapi.c
763        The type glp_ulong was replaced by glp_long. This affects only
764        the api routine glp_mem_usage.
765
766        * glplib.c
767        Compressed data file support was added. This feature requires
768        the zlib data compression libraries and allows compressing and
769        decompressing .gz files "on the fly".
770
771        * glpcli.h, glpcli.c
772        Command-line interface routines were added. (This feature is
773        incomplete so far.)
774
775Sun Mar 02 12:00:00 2008 Andrew Makhorin <mao@mai2.rcnet.ru>
776
777        * GLPK 4.27 (12:0:12) has been released
778
779        * glpsql.h, glpsql.c
780        Two MathProg table drivers for iODBC and MySQL contributed by
781        Heinrich Schuchardt <heinrich.schuchardt@gmx.de> were added to
782        the package.
783
784        * glpmpl05.c
785        Mathprog table driver for xBASE was added to the package.
786
787        * glpmpl03.c
788        A minor was fixed in the MathProg translator (if some field
789        specified in the table statement is missing in corresponding
790        input table, the bug causes abnormal termination). Thanks to
791        Heinrich Schuchardt <heinrich.schuchardt@gmx.de> for the bug
792        report.
793
794        * glpmpl.h, glpmpl.c
795        STRING data type was replaced by plain character strings.
796
797Sun Feb 17 12:00:00 2008 Andrew Makhorin <mao@mai2.rcnet.ru>
798
799        * GLPK 4.26 (11:0:11) has been released
800
801        * glpmpl.h, glpmpl01.c, glpmpl03.c, glpmpl05.c
802        The table statement was implemented. Description of this new
803        feature is given in file doc/tables.txt.
804
805        * glpios03.c
806        A bug causing zero divide error on computing euclidean norm of
807        the cut coefficient vector was fixed.
808
809Wed Dec 19 12:00:00 2007 Andrew Makhorin <mao@mai2.rcnet.ru>
810
811        * GLPK 4.25 (10:0:10) has been released
812
813        * glpapi10.c
814        Routines lpx_eval_tab_row and lpx_eval_tab_col were replaced by
815        glp_eval_tab_row and glp_eval_tab_col.
816
817        * glpios03.c, glpios05.c
818        Gomory's mixed integer cuts were implemented.
819
820        * glpscs.h, glpscs.c
821        Segmented character string routines are no longer used and were
822        removed from the package.
823
824Wed Nov 21 12:00:00 2007 Andrew Makhorin <mao@mai2.rcnet.ru>
825
826        * GLPK 4.24 (9:0:9) has been released
827
828        * src/glplpx16.c
829        A bug was fixed in the routine lpx_write_cpxlp. If a variable
830        x has upper bound and no lower bound, it should appear in the
831        bounds section as "-inf <= x <= u", not as "x <= u". Thanks to
832        Enric Rodriguez <erodri@lsi.upc.edu> for the bug report.
833
834        * src/glpios03.c, src/glpios04.c, src/glpios05.c
835        MIR (mixed integer rounding) cuts were implemented.
836
837Sun Oct 28 12:00:00 2007 Andrew Makhorin <mao@mai2.rcnet.ru>
838
839        * GLPK 4.23 (8:0:8) has been released
840
841        * src/glplib05.c, configure.ac
842        Check for vsnprintf was added.
843
844        * include/glppds.h, src/glppds.c
845        A module to scan plain data was added.
846
847        * src/glpapi09.c
848        The following new API routines were added:
849        glp_read_sol    read basic solution from text file;
850        glp_write_sol   write basic solution to text file;
851        glp_read_ipt    read interior-point solution from text file;
852        glp_write_ipt   write interior-point solution to text file;
853        glp_read_mip    read MIP solution from text file;
854        glp_write_mip   write MIP solution to text file.
855
856        * src/glpapi12.c
857        Advanced API routine glp_free_env was added.
858
859        * examples/glpsol.c
860        The following three command-line options were added:
861        --mipgap tol    set relative MIP gap tolerance
862        -r filename     read solution from filename
863        -w filename     write solution to filename
864
865Wed Sep 19 12:00:00 2007 Andrew Makhorin <mao@mai2.rcnet.ru>
866
867        * GLPK 4.22 (7:0:7) has been released
868
869        * src/glpios02.c
870        A bug was fixed in the MIP preprocessor (ios_preprocess_node).
871        Thanks to Roberto Bagnara <bagnara@cs.unipr.it> (Department of
872        Mathematics, University of Parma, Italy) for the bug report.
873
874        * src/glpios02.c
875        A bug was fixed in the MIP preprocessor (col_implied_bounds),
876        due to which constraint coefficients with small magnitude could
877        lead to wrong implied bounds of structural variables.
878
879        * src/glpipp02.c
880        A similar bug was fixed in the routine reduce_bounds.
881
882        * src/glpapi01.c
883        A bug was fixed in the routines glp_set_mat_row and
884        glp_set_mat_col. (The bug appeared due to incorrect removing
885        zero elements from the row/column lists.)
886
887        * src/glplpx14.c
888        A bug was fixed in the API routines lpx_read_mps and
889        lpx_read_freemps, due to which bounds of type LI specified in
890        BOUNDS section were incorrectly processed.
891
892        * src/glplib05.c
893        A call to standard function vsprintf was replaced by a call to
894        vsnprintf for security reasons. Many thanks to Peter T. Breuer
895        <ptb@inv.it.uc3m.es> and Rafael Laboissiere <rafael@debian.org>.
896
897Tue Aug 28 12:00:00 2007 Andrew Makhorin <mao@mai2.rcnet.ru>
898
899        * GLPK 4.21 (6:0:6) has been released
900
901        * glpscg.h, glpscg.c
902        Routines to maintain sparse cliqued graph were added.
903
904        * glpios02.c
905        MIP preprocessing routines were added.
906
907        * glpk.h, glpios.h, glpios03.c
908        New reasons for calling the callback routine were introduced
909        in the MIP solver.
910
911        * glpapi08.c
912        Default backtracking strategy was changed to best local bound.
913
914        * glpapi11.c
915        New API routine glp_term_out to enable/disable terminal output
916        was added.
917
918        * glprng.h, glprng02.c
919        Two routines to generate uniformly distributed pseudo-random
920        floating-point numbers were added.
921
922Thu Jul 26 12:00:00 2007 Andrew Makhorin <mao@mai2.rcnet.ru>
923
924        * GLPK 4.20 (5:0:5) has been released
925
926        * glpk.h, glpapi08.c
927        The routine lpx_integer was replaced by an equivalent routine
928        glp_intopt. Also new API routine glp_init_iocp was added.
929
930        * glpiet.h, glpiet.c
931        Routines implementing the implicit enumeration tree are
932        no longer used and therefore were removed from the package.
933
934        * glpios.h, glpios01.c, glpios02, glpios03
935        Routines implementing the integer optimization suite being
936        replaced by a new version were removed from the package.
937
938        * glpmip.h, glpmip01.c, glpmip02.c
939
940        Routines implementing the B&B method being replaced by a new
941        version were removed from the package.
942
943        * glpios.h, glpios01.c, glpios02.c
944
945        Routines implementing a new version of the integer optimization
946        suite (IOS) based on the B&B method were added to the package.
947
948        * glpk.h, glpapi10.c
949        Branch-and-bound interface routines were added to the package.
950
951        * examples/tspsol.c
952        The TSP solver based on old version of the integer optimization
953        suite is no more supported and was removed from the package.
954
955        * glpipp02.c
956        An error in the routine reduce_bounds was fixed; thanks to
957        Graham Rockwell <bionomicron@gmail.com> for the bug report.
958
959        * glpk.latex
960        A new edition of the reference manual was included.
961
962Thu Jul 05 12:00:00 2007 Andrew Makhorin <mao@mai2.rcnet.ru>
963
964        * GLPK 4.19 (4:0:4) has been released
965
966        The principal change is upgrading to GPLv3.
967
968        * glpapi01.c
969        A serious bug in the routine glp_del_cols was fixed; thanks to
970        Cedric[FR] <fox2113@wanadoo.fr> for the bug report. The bug
971        appeared because on deleting non-basic columns the basis header
972        remained valid, however, contained invalid (old) column ordinal
973        numbers.
974
975        * glpapi10.c
976        A new advanced API routine glp_mem_limit was added.
977
978        * glplpx01.c
979        The case GLP_EBOUND was added to the routine lpx_simplex.
980        Thanks to Cameron Kellough <Cameron.Kellough@sri.com> for the
981        bug report.
982
983        * glplpx19.c
984        An API routine lpx_write_pb to write the problem instance in
985        OPB (pseudo boolean) format format was added. Thanks to Oscar
986        Gustafsson <oscarg@isy.liu.se> for the contribution.
987
988        * glpsol.c
989        Two new options --wpb and --wnpb were added to glpsol to write
990        the problem instance in OPB format.
991
992Mon Jun 25 12:00:00 2007 Andrew Makhorin <mao@mai2.rcnet.ru>
993
994        * GLPK 4.18 (3:0:3) has been released
995
996        * glplib.h
997        Type names ulong_t and uldiv_t were changed to glp_ulong and
998        glp_uldiv to avoid conflicts with standard type names on some
999        platforms. Thanks to Boris Wirtz <Boris.Wirtz@uni-oldenburg.de>
1000        for the bug report.
1001
1002        * glpbfd.*, glpfhv.*, glplpf.*
1003        LP basis factorization routines were made tidy.
1004
1005        * glpk.h, glpapi04.c
1006        The following API routines were added:
1007        glp_set_rii, glp_set_sjj, glp_get_rii, glp_get_sjj.
1008
1009        * glpk.h, glpapi06.c
1010        The routine lpx_simplex was replaced by an equivalent routine
1011        glp_simplex. Also new API routine glp_init_smcp was added.
1012
1013        * glpk.h, glpapi09.c
1014        The following advanced API routines were added:
1015        glp_bf_exists, glp_factorize, glp_bf_updated, glp_get_bfcp,
1016        glp_set_bfcp, glp_get_bhead, glp_get_row_bind, glp_get_col_bind,
1017        glp_ftran, glp_btran.
1018
1019        * glpk.latex
1020        A new edition of the reference manual was included.
1021
1022        * examples/dea.mod, examples/food.mod, examples/food2.mod
1023        Three examples in the MathProg language were added.
1024        Thanks to Sebastian Nowozin <nowozin@gmail.com>.
1025
1026Sat May 26 12:00:00 2007 Andrew Makhorin <mao@mai2.rcnet.ru>
1027
1028        * GLPK 4.17 (2:0:2) has been released
1029
1030        * glpdmp.h, glpdmp.c
1031        Memory pool routines were replaced by a new version.
1032
1033        * glpscs.h, glpscs.c
1034        Segmented string routines were replaced by a new version.
1035
1036        * glplpx08.c, glplpx09.c
1037        Now the MIP problem may have no integer columns.
1038
1039        * glpapi01.c
1040        The routines glp_set_mat_row, glp_set_mat_col, and glp_load_mat
1041        were modified to allow zero elements (which are not stored in
1042        the constraint matrix).
1043
1044        * glpscf.h, glpscf.c
1045        Schur complement factorization routines were implemented.
1046
1047        * glplpf.h, glplpf.c
1048        LP basis factorization routines based on LU-factorization and
1049        Schur complement were implemented.
1050
1051        * glplpx02.c, glplpx03.c
1052        New control parameter LPX_K_BFTYPE was introduced to choose the
1053        basis factorization type used by the simplex method routines.
1054
1055        * glpsol.c
1056        Three new command-line options were added to choose the basis
1057        factorization type used by the simplex method routines: --luf,
1058        --cbg, and --cgr.
1059
1060        * glpk.latex
1061        A new edition of the reference manual was included.
1062
1063Sat May 05 12:00:00 2007 Andrew Makhorin <mao@mai2.rcnet.ru>
1064
1065        * GLPK 4.16 (1:0:1) has been released
1066
1067        * glpk.h, glpapi.c, glplpx01.c, glplpx02.c
1068        Names of a number basic api routines were changed and now have
1069        the prefix 'glp_'. To keep backward compatibility these routines
1070        are also available via their old names prefixed with 'lpx_'.
1071
1072        * glplpx19.c
1073        Three new api routines were added: glp_version, glp_term_hook,
1074        and glp_mem_usage.
1075
1076        * glpk.latex, gmpl.texi
1077        A new edition of the reference manuals was included.
1078
1079        * lpglpk40.c
1080        This example program is no longer supported and therefore was
1081        removed from the package.
1082
1083Sun Feb 18 12:00:00 2007 Andrew Makhorin <mao@mai2.rcnet.ru>
1084
1085        * GLPK 4.15 (0:0:0) has been released
1086
1087        * configure.ac, Makefile.am
1088        Autotools specification files were changed to use GNU Libtool
1089        that allows building the static as well as shared GLPK library.
1090        Thanks to Rafael Laboissiere <rafael@debian.org>.
1091
1092Mon Feb 05 08:00:00 2007 Andrew Makhorin <mao@mai2.rcnet.ru>
1093
1094        * GLPK 4.14 has been released
1095        Now GLPK conforms to ILP32, LLP64, and LP64 programming models
1096        (the latter seems to be the ultimate choice regarding 64-bit
1097        architectures). Note that GLPK itself is a 32-bit application,
1098        and the conformity only means that the package works correctly
1099        on all these arenae. Nevertheless, on 64-bit platforms it is
1100        possible to use more than 4GB of memory, if necessary.
1101
1102        * Makefile
1103        Starting from this release only the header glpk.h is needed to
1104        be installed.
1105
1106        * glplib01.c
1107        Two routines bigmul and bigdiv which performs multiplication
1108        and division of unsigned integers of arbitrary precision were
1109        added.
1110
1111        * glplib02.c
1112        A set of 64-bit arithmetic routines were added.
1113
1114        * glplib04.c
1115        Some low-level library routines were improved and renamed.
1116
1117        * glpcfg.h
1118        The macro GLP_TM_SPEC were introduced to specify a version of
1119        the time routine depending on the host environment.
1120
1121Mon Nov 13 12:00:00 2006 Andrew Makhorin <mao@mai2.rcnet.ru>
1122
1123        * GLPK 4.13 has been released
1124
1125        * configure.in
1126        '-lm' bug was fixed.
1127
1128        * glpbfx.h, glpbfx.c
1129        Basis factorization interface routines based on exact (bignum)
1130        arithmetic were implemented.
1131
1132        * glpssx.h, glpssx1.c, glpssx2.c
1133        Simplex method routines based on exact (bignum) arithmetic were
1134        implemented.
1135
1136        * glplpx6e.c
1137        The routine lpx_exact, which is an easy-to-use driver to the
1138        exact simplex method, was added.
1139
1140        * glpsol.c
1141        Two command-line options were added: '--exact' and '--xcheck'.
1142
1143Wed Nov 08 12:00:00 2006 Andrew Makhorin <mao@mai2.rcnet.ru>
1144
1145        * GLPK 4.12 has been released
1146
1147        * glpcfg.h
1148        The package configuration file was added.
1149
1150        * glplib2.c
1151        Alternative version of the routines umalloc, ucalloc, and ufree
1152        was provided. It does not limit the amount of allocated memory
1153        to INT_MAX bytes and therefore can be used on platforms where
1154        sizeof(void *) > sizeof(int). To enable this version one should
1155        define the preprocessor variable GLP_HUGE_MEM.
1156
1157        * glprng.c
1158        The routine rng_create_rand was changed to initialize the
1159        generator using seed = 1, not 0, to conform ISO C requirements.
1160
1161        * glpgmp.h, glpgmp.c
1162        A set of bignum arithmetic routines implementing operations on
1163        integers and rationals was added. These routines are compatible
1164        with the GNU MP library.
1165
1166        NOTE: To attain a much better performance it is recommended to
1167        use, if possible, the original GNU MP library rather than the
1168        GLPK version, by defining the preprocessor variable GLP_USE_GMP.
1169
1170        * glplux.h, glplux.c
1171        A tentative implementation of sparse LU-factorization based on
1172        exact (bignum) arithmetic was added.
1173
1174        * glpssx.h, glpssx.c
1175        A tentative implementation of some simplex method routines based
1176        on exact (bignum) arithmetic was added.
1177
1178        * glplpx6f.c
1179        A preliminary implementation of the routine lpx_exact_check was
1180        added. This routine checks the current basis for primal and dual
1181        feasibility using exact (bignum) arithmetic.
1182
1183        * examples/glpsol.c
1184        The command-line option '--xcheck' was introduced to check the
1185        current basis for feasibility using exact (bignum) arithmetic.
1186
1187Tue Jul 25 12:00:00 2006 Andrew Makhorin <mao@mai2.rcnet.ru>
1188
1189        * GLPK 4.11 has been released.
1190
1191        * include/glpbfi.h, src/glpbfi.c
1192        Basis factorization interface routines were added.
1193
1194        * include/glpluf.h, src/glpluf1.c
1195        Hypersparse solution routines were added.
1196
1197        * include/glpinv.h, src/glpinv1.c
1198        Hypersparse solution routines (fake version) were added.
1199
1200        * include/glpmpl.h, src/glpmpl.c
1201        Built-in functions card, length, and substr were implemented.
1202        Output redirection in the printf statement was implemented.
1203
1204        * examples/graph.mod, examples/crypto.mod
1205        Two example models illustrating new features of the modeling
1206        language were included.
1207
1208Thu May 11 12:00:00 2006 Andrew Makhorin <mao@mai2.rcnet.ru>
1209
1210        * GLPK 4.10 has been released.
1211
1212        * src/glplpx8a.c
1213        A fragment was added to the routines lpx_read_mps and
1214        lpx_read_freemps to accept LI bound type (it is similar to LO,
1215        however, additionally marks the column as integer).
1216
1217        * include/glpbfi.h, src/glpbfi.c
1218        The module glpbfi which implements the basis factorization
1219        interface (BFI) was added.
1220
1221        * src/glplpx7a.c
1222        The routine lpx_cover_cut to generate mixed cover cuts was
1223        added.
1224
1225        * src/glplpx7b.c
1226        The routine lpx_clique_cut to generate clique cuts and related
1227        routines to maintain the conflict graph were added.
1228
1229        * include/glplpx.h, src/glplpx5.c
1230        The routine lpx_cpx_basis implementing Bixby's algorithm to
1231        construct an initial LP basis was added.
1232
1233        * examples/glpsol.c
1234        Command-line option '--bib' was added which allows building
1235        an initial LP basis using Bixby's algorithm.
1236        Default command-line option '--mps' was changed to '--freemps'.
1237
1238        * examples/cf12a.mod, examples/cf12b.mod
1239        Two examples in MathProg (curve fitting problem) were added.
1240        Thanks to Dr. Harley Mackenzie <hjm@hardsoftware.com>.
1241
1242Tue Jan 17 12:00:00 2006 Andrew Makhorin <mao@mai2.rcnet.ru>
1243
1244        * GLPK 4.9 has been released.
1245
1246        * glpipp.h, glpipp1.c, glpipp2.c
1247        A MIP presolver were implemented (currently incomplete). It is
1248        used internally in the routine lpx_intopt (see below).
1249
1250        * glplpx6d.c, glplpx7a.c
1251        An advanced branch-and-bound solver (the routine lpx_intopt)
1252        were implemented.
1253
1254        * glplpx6c.c
1255        The routine lpx_check_int to check MIP feasibility conditions
1256        was added.
1257
1258        * glplpx8a.c
1259        The routine lpx_print_mip was changed to print MIP feasibility
1260        conditions.
1261
1262        * glpmpl.h, glpmpl1.c, glpmpl3.c
1263        The built-in functions sin, cos, atan, and atan2 were added to
1264        the MathProg language.
1265
1266        * doc/lang.*
1267        Some typos were fixed.
1268        Thanks to Minh Ha Duong <haduong@centre-cired.fr> (CIRED, CNRS).
1269
1270Wed Jan 12 12:00:00 2005 Andrew Makhorin <mao@mai2.rcnet.ru>
1271
1272        * GLPK 4.8 has been released.
1273
1274        * glpspx.h, glpspx1.c, glpspx2.c, glplpx6a.c
1275        Simplex method routines were changed due to a new format of the
1276        constraint matrix.
1277
1278        * glpmat.h, glpmat.c
1279        Sparse matrix routines were re-implemented using storage-by-rows
1280        format.
1281
1282        * glpipm.h, glpipm.c, glplpx6b.c
1283        Interior-point method routines were changed due to a new format
1284        of sparse matrices.
1285
1286        * glpchol.h, glpchol.c
1287        Old version of Cholesky factorization routines being replaced by
1288        a new one (see glpmat.c) was removed from the package.
1289
1290        * glplpx8c.c
1291        Minor bug was fixed in api routine lpx_read_cpxlp.
1292
1293Mon Aug 23 12:00:00 2004 Andrew Makhorin <mao@mai2.rcnet.ru>
1294
1295        * GLPK 4.7 has been released.
1296
1297        * glplpx.h, glplpx1.c
1298        New core API routines were added (but not documented yet):
1299        lpx_order_matrix, lpx_create_index, lpx_find_row, lpx_find_col,
1300        lpx_delete_index.
1301
1302        * glplpx8a.c
1303        API routine lpx_read_mps was re-implemented, and two new API
1304        routines lpx_read_freemps and lpx_write_freemps were added to
1305        support free MPS format.
1306
1307        * glplpx8c.c
1308        Two API routines lpx_read_cpxlp and lpx_write_cpxlp (formerly
1309        named lpx_read_lpt and lpx_write_lpt) were re-implemented.
1310
1311        * glpmps.h, glpmps.c
1312        This module formerly used in lpx_read_mps was removed from the
1313        package.
1314
1315        * glplpt.h, glplpt.c
1316        This module formerly used in lpx_read_lpt was removed from the
1317        package.
1318
1319        * glpmip.h, glpmip1.h, glpmip2.h
1320        New MIP routines mip_best_node and mip_relative_gap were added
1321        due to suggestion of Brady Hunsaker <hunsaker@engr.pitt.edu>.
1322
1323        * glpsol.c
1324        The following new command-options were added:
1325        --freemps  to read problem data in free MPS format
1326        --wfreemps to write problem data in free MPS format
1327        --cpxlp    to read problem data in CPLEX LP format
1328        --wcpxlp   to write problem data in CPLEX LP format
1329        --bas      to read LP basis from a text file in MPS format
1330        --wbas     to write LP basis to a text file in MPS format
1331        --mostf    to use "most fractional" branching heuristic
1332        --bestb    to use "best bound" backtracking heuristic
1333
1334        * contrib/deli/*.*
1335        GLPK Delphi interface module was temporarily removed from the
1336        distribution due to licensing problems.
1337
1338        * contrib/glpkmex/*.*
1339        GLPK Matlab interface module was temporarily removed from the
1340        distribution due to licensing problems.
1341
1342        * contrib/jni/*.*
1343        GLPK Java interface module was temporarily removed from the
1344        distribution due to licensing problems.
1345
1346Wed Aug 04 12:00:00 2004 Andrew Makhorin <mao@mai2.rcnet.ru>
1347
1348        * GLPK 4.6 has been released.
1349
1350        * glpmpl.h, glpmpl1.c, glpmpl2.c, glpmpl3.c, glpmpl4.c
1351        Three new statements were implemented in the GNU MathProg
1352        language: solve, printf, and for. Also some bugs were fixed.
1353
1354        * glplpx.h, glplpx8e.c
1355        Two API routines were added: lpx_read_prob and lpx_write_prob,
1356        which allow reading and writing problem data in GNU LP format.
1357
1358        * glpsol.c
1359        Three new command-line options were added: --glp (to read
1360        problem data in GNU LP format), --wglp (to write problem data
1361        in GNU LP format), and --name (to change problem name).
1362
1363        * glprng.h, glprng.c
1364        A portable pseudo-random number generator was implemented as a
1365        separate module.
1366
1367        * glplib4.c
1368        The old implementation of a pseudo-random number generator was
1369        removed from the package.
1370
1371        * doc/lang.*, doc/refman.*
1372        New edition of the GLPK documentation was included.
1373
1374        * contrib/glpkmex/*.*
1375        A new version of GLPKMEX was included in the distribution. For
1376        more details see contrib/glpkmex/ChangeLog.
1377
1378Mon Jul 19 12:00:00 2004 Andrew Makhorin <mao@mai2.rcnet.ru>
1379
1380        * GLPK 4.5 has been released.
1381
1382        * glpmip.h, glpmip1.c, glpmip2.c, glplpx6c.c
1383        New implementation of the branch-and-bound method was added.
1384        It replaces the old implementation, which was removed from the
1385        package.
1386
1387        * glpies.h, glpies1.c, glpies2.c, glpies3.c
1388        Modules used in the old implementation of the branch-and-bound
1389        method were removed from the package.
1390
1391        * glplib2.c
1392        Now if the preprocessor variable GLPHUGEMEM is defined, other
1393        version of the routines umalloc, ucalloc, and ufree is used on
1394        compiling the package. This allows avoiding memory allocation
1395        problems on platforms where sizeof(void *) > sizeof(int), for
1396        example, where addresses are 64-bit while integers are 32-bit.
1397        The modification was made due to a bug report provided by Karel
1398        Zimmermann <kzimm@diamant.jouy.inra.fr> and Christophe Caron
1399        <caron@diamant.jouy.inra.fr>.
1400
1401Sat Jan 17 12:00:00 2004 Andrew Makhorin <mao@mai2.rcnet.ru>
1402
1403        * GLPK 4.4 has been released.
1404
1405        * glplpx.h, glplpx*.c
1406        All API routines were re-implemented using new data structures.
1407        Some new API routines were added and some existing API routines
1408        became obsolete as shown below:
1409
1410        Obsolete API routine   Equivalent new API routine
1411        lpx_check_name         (no more supported)
1412        lpx_set_obj_c0         lpx_set_obj_coef
1413        lpx_set_row_coef       (no more supported)
1414        lpx_set_col_coef       lpx_set_obj_coef
1415        lpx_load_mat           (no more supported)
1416        lpx_load_mat3          lpx_load_matrix
1417        lpx_unmark_all         (no more supported)
1418        lpx_mark_row           (no more supported)
1419        lpx_mark_col           (no more supported)
1420        lpx_clear_mat          (no more supported)
1421        lpx_del_items          lpx_del_rows, lpx_del_cols
1422        lpx_get_row_bnds       lpx_get_row_type, lpx_get_row_lb,
1423                               lpx_get_row_ub
1424        lpx_get_col_bnds       lpx_get_col_type, lpx_get_col_lb,
1425                               lpx_get_col_ub
1426        lpx_get_obj_c0         lpx_get_obj_coef
1427        lpx_get_row_coef       (no more supported)
1428        lpx_get_col_coef       lpx_get_obj_coef
1429        lpx_get_row_mark       (no more supported)
1430        lpx_get_col_mark       (no more supported)
1431        lpx_get_row_info       lpx_get_row_stat, lpx_get_row_prim,
1432                               lpx_get_row_dual
1433        lpx_get_col_info       lpx_get_col_stat, lpx_get_col_prim,
1434                               lpx_get_col_dual
1435        lpx_get_ips_stat       lpx_ipt_status
1436        lpx_get_ips_row        lpx_ipt_row_prim, lpx_ipt_row_dual
1437        lpx_get_ips_col        lpx_ipt_col_prim, lpx_ipt_col_dual
1438        lpx_get_ips_obj        lpx_ipt_obj_val
1439        lpx_get_mip_stat       lpx_mip_status
1440        lpx_get_mip_row        lpx_mip_row_val
1441        lpx_get_mip_col        lpx_mip_col_val
1442        lpx_get_mip_obj        lpx_mip_obj_val
1443
1444        Obsolete API routines were kept for backward compatibility,
1445        however, they will be removed in the future.
1446
1447        * doc/refman.*
1448        New edition of the GLPK reference manual containing description
1449        of all new API routines was included.
1450
1451        * contrib/glpkmex/*.*
1452        GLPKMEX, a Matlab MEX interface to GLPK package, contributed by
1453        Nicolo Giorgetti <giorgetti@dii.unisi.it> was included.
1454
1455        * doc/GLPK_FAQ.txt
1456        GLPK FAQ contributed by Harley Mackenzie <hjm@bigpond.com> was
1457        included.
1458
1459Fri Dec 12 12:00:00 2003 Andrew Makhorin <mao@mai2.rcnet.ru>
1460
1461        * GLPK 4.3 has been released.
1462
1463        * configure.in
1464        The bug, due to which the standard math library is not linked on
1465        some platforms, was fixed.
1466
1467        * glpmpl3.c
1468        The bug (0 ** y) was fixed in the routine fp_power.
1469
1470        * glpmpl.h, glpmpl1.c, glpmpl3.c
1471        Some new built-in functions (round, trunc, Irand224, Uniform01,
1472        Uniform, Normal01, Normal) were added to the MathProg language.
1473
1474        * glpmpl1.c
1475        The MathProg syntax was changed to allow writing 'subj to'.
1476
1477        * glplpx.h, glplpx1.c, glplpx2.c
1478        The new api routine lpx_get_ray_info was added.
1479
1480        * glplpx8a.c
1481        The api routine lpx_print_sol was changed to print the number of
1482        non-basic variable, which causes primal unboundness.
1483
1484        * glpmps.c
1485        The code was changed to avoid errors on compiling the package on
1486        Mac OS X. Thanks to Andre Girard <andre@inrs-emt.uquebec.ca> for
1487        the bug report.
1488
1489        * doc/lang.*, doc/refman.*
1490        Several typos were fixed and some new material was added in the
1491        glpk documentation.
1492
1493Fri Nov 14 12:00:00 2003 Andrew Makhorin <mao@mai2.rcnet.ru>
1494
1495        * GLPK 4.2 has been released.
1496
1497        * glpiet.h, glpiet.c, glpios.h, glpios1.c, glpios2.c, glpios3.c
1498        A preliminary implementation of the Integer Optimization Suite
1499        (IOS) was included in the package. Eventually IOS will replace
1500        the Implicit Enumeration Suite (IES).
1501
1502        * glplpx.h, glplpx6d.c
1503        A dummy version of the integer optimization routine lpx_intopt
1504        was included in the package. Later this routine will replace the
1505        routine lpx_integer.
1506
1507        * examples/glpsol.c
1508        A new command-line option --int-opt was added to the solver to
1509        call lpx_intopt rather than lpx_integer.
1510
1511        * glpbcs.h, glpbcs1.c, glpbcs2.c
1512        Being replaced by IOS routines (see above) the Branch-and-Cut
1513        Framework (BCS) routines were removed from the package.
1514
1515        * examples/tspsol.c
1516        Stand-alone Symmetric TSP solver was completely re-programmed
1517        using IOS routines.
1518
1519        * glplib.h, glplib2.c, glplib4.c
1520        The random-number generator was implemented. It is based on the
1521        module GB_FLIB from the Stanford GraphBase originally developed
1522        by Donald Knuth.
1523
1524        * glphbsm.c, glplpx8a.c, glpmps.c
1525        All calls to fopen/fclose were replaced by corresponding calls
1526        to ufopen/ufclose due to bug reports provided by Morten Welinder
1527        <terra@gnu.org> and <jpark@sfwmd.gov>.
1528
1529        * glpmps.c
1530        The code was made re-entrant.
1531
1532        * glplpx8b.c
1533        API routine lpx_print_sens_bnds for bounds sensitivity analysis
1534        contributed by Brady Hunsaker <hunsaker@engr.pitt.edu> was added
1535        to the package. This feature is also available in glpsol via the
1536        command-line option --bounds.
1537
1538        * contrib/jni/*.*
1539        New version of GLPK JNI (Java Native Interface) contributed by
1540        Chris Rosebrugh <cpr@pobox.com> was added to the package.
1541
1542        * contrib/deli/*.*
1543        GLPK DELI (Delphi Interface) contributed by Ivo van Baren
1544        <i.van.baren@freeler.nl> was added to the package.
1545
1546        * glplpx3.c
1547        Default method to scale the problem was changed to equilibration
1548        scaling (lp->scale = 1 in lpx_reset_parms).
1549
1550        * glplpx6a.c
1551        Two minor (non-critical) typos were fixed due to report provided
1552        by Andrew Hamilton-Wright <andrewhw@ieee.org>.
1553
1554        * glplpp2.c
1555        An untested case (line 941) had been tested due to bug report
1556        provided by Jiri Spitz <jiri.spitz@telecom.cz>.
1557
1558        * w32bc5.mak, w32vc6.mak, w32vc6d.mak, d32dmc.mak
1559        Several makefiles were added to allow building GLPK library for
1560        some non-GNU 32-bit platforms.
1561
1562Sat Aug 23 12:00:00 2003 Andrew Makhorin <mao@mai2.rcnet.ru>
1563
1564        * GLPK 4.1 has been released.
1565
1566        * glpmpl1.c, glpmpl3.c
1567        Some bugs were fixed in the MathProg translator due to the bug
1568        reports provided by Giles Thompson <gwpt1@cus.cam.ac.uk>:
1569        conditional set expressions were incorrectly parsed;
1570        dimen attribute was not set by default when a set was used
1571        recursively in its own declaration;
1572        logical expressions ... in if ... then ... else ... did not
1573        work;
1574        displaying set expressions did not free memory allocated for
1575        temporary results.
1576
1577        * glpmpl3.c (reduce_terms)
1578        Implementation of summation of linear forms over domain was
1579        improved to reduce complexity of that operation from O(n*n) to
1580        O(n*log n). The improvement was made due to a report provided
1581        by Sebastien de Menten <sdementen@hotmail.com>.
1582
1583        * glplpx6a.c (line 1056), glpmip1.c (line 641)
1584        Two minor bugs were fixed due to the bug report provided by
1585        Kendall Demaree <kendal.demaree@verizon.net>.
1586
1587        * glplpx.h, glplpx6a.c
1588        The method of one artificial variable implemented in the routine
1589        lpx_prim_art and used on the phase I in the glpk simplex solver
1590        has a serious defect: for some lp instances it erroneously
1591        reports that the problem has no primal feasible solution. This
1592        error appears when the column of the artificial variable, which
1593        enters the basis to make it primal feasible, has large
1594        constraint coefficients, that leads to small reduced costs of
1595        non-basic variables and premature termination of the search,
1596        i.e. to wrong conclusion that the problem has no primal feasible
1597        solution. To avoid this defect the routine lpx_prim_feas was
1598        included. It implements the method of implicit artifical
1599        variables (based on minimization of the sum of infeasibilities),
1600        which is a bit slower but much more robust. The routine
1601        lpx_prim_feas having the same functionality now is used instead
1602        the routine lpx_prim_art.
1603
1604        * glpinv.h, glpinv.c
1605        The test used in the routine inv_update to detect low accuracy
1606        after updating LU-factorization of the basis matrix was replaced
1607        by a new, more robust test.
1608
1609        * glplpx6c.c
1610        Selecting an active node to be solved next in the routine
1611        btrack_bestp was changed. Now, if any integer feasible solution
1612        has not been found yet, the routine chooses an active node which
1613        has the minimal sum of integer infeasibilities.
1614
1615        * glpmip.h, glpmip1.c
1616        The additional flag int_obj was included in the structure
1617        MIPTREE used by the branch-and-bound. This flag is set in the
1618        routine mip_create_tree and used in the routine is_better. It
1619        means that the objective is integral, i.e. depends only on
1620        integer variables with integer objective coefficients. The test
1621        used in the routine check_integrality was also replaced by a
1622        new, more reasonable one.
1623
1624        * glplpx1.c
1625        A minor bug was fixed in the routine lpx_check_name.
1626
1627        * glpmpl.h, glpmpl4.c, glplpx8d.c
1628        The flag skip_data was added to the parameter list of the
1629        routine mpl_read_model. If this flag is set, the data section
1630        in the model file is ignored. Corresponding change was made in
1631        the routine lpx_read_model. Now, if both model and data files
1632        are specified, the data section in the model file is ignored.
1633
1634        * glplpx8c.c
1635        A minor bug (wrong format used for writing free columns) in the
1636        routine lpx_write_lpt was fixed due to the bug report provided
1637        by Bernhard Schmidt <schmidt@math.uni-augsburg.de>
1638
1639        * sample/glpsol.c
1640        The command-line parameter --tmlim, which allows limiting the
1641        solution time, was added.
1642
1643        * doc/lang.*, doc/refman.*
1644        New edition of the GLPK documentation was included.
1645
1646        * java-binding/*.*
1647        New version of the GLPK JNI (Java Native Interface) package was
1648        included in the distribution.
1649
1650        * sample/lpglpk40.c
1651        A non-trivial example was added. It allows using GLPK as a base
1652        LP solver for Concorde, a program for solving Traveling Salesman
1653        Problem (TSP). For details see comments in lpglpk40.c.
1654
1655        * sample/*.mod
1656        Some examples of LP and MIP models written in GNU MathProg were
1657        added.
1658
1659Tue May 06 12:00:00 2003 Andrew Makhorin <mao@mai2.rcnet.ru>
1660
1661        * GLPK 4.0 has been released.
1662
1663        * glpmpl.h, glpmpl1.c, glpmpl2.c, glpmpl3.c, glpmpl4.c
1664        The model translator for the GNU MathProg modeling language was
1665        implemented and included in the package.
1666
1667        * glplpx.h, glplpx8d.c
1668        The api routine lpx_read_model, which is an interface to the
1669        MathProg translator, was included in the package.
1670
1671        * glplpx.h, glplpx8a.c
1672        The api routine lpx_print_prob for writing LP/MIP problem data
1673        in plain text format was included in the package.
1674
1675        * sample/glpsol.c
1676        New version of the GLPK stand-alone LP/MIP solver that supports
1677        the GNU MathProg modeling language was implemented.
1678
1679        * doc/lang.latex, doc/lang.dvi, doc/lang.ps
1680        The document "GLPK: Modeling Language GNU MathProg" was included
1681        in the package.
1682
1683        * doc/refman.latex, doc/refman.dvi, doc/refman.ps
1684        New edition of the GLPK Reference Manual was included in the
1685        package.
1686
1687        * glplpx8c.c
1688        A bug in the api routine lpx_write_lpt was fixed. Due to that
1689        bug an addressing error occured in the routine if the objective
1690        function has the non-zero constant term.
1691
1692        * glplan.h, glplan1.c, glplan2.c, glplan3.c, glplan4.c,
1693        * glplan5.c, glplan6.c, glplan7.c, glplan8.c, glplpx8b.c
1694        All modules of the translator for the GLPK/L modeling language
1695        were removed from the package, because GLPK/L being completely
1696        superseded by GNU MathProg is no more supported.
1697
1698Tue Mar 25 12:00:00 2003 Andrew Makhorin <mao@mai2.rcnet.ru>
1699
1700        * GLPK 3.3 has been released.
1701
1702        * glplpp.h, glplpp1.c, glplpp2.c
1703        An implementation of the built-in LP presolver was added to the
1704        package.
1705
1706        * glplpx.h
1707        The flag presol was added to the structure LPX. This flag tells
1708        the lpx_simplex whether the built-in LP presolver should be used
1709        or not. By default this flag is off. Also three macros (namely
1710        LPX_E_NOPFS, LPX_E_NODFS, and LPX_K_PRESOL) that concern using
1711        the LP presolver were introduced.
1712
1713        * glplpx3.c, glplpx6a.c
1714        These modules was changed to use the built-in LP presolver.
1715
1716        * sample/glpsol.c
1717        Command line options --presol and --nopresol that concern using
1718        the LP presolver were added to the stand-alone LP/MIP solver.
1719
1720        * glplan1.c
1721        This module was changed to allow declaring sets like A[1:10] in
1722        the models written in the GLPK/L modeling language.
1723
1724        * doc/refman.latex, doc/lang.latex
1725        New editions of the documents "GLPK User's Guide" and "GLPK/L
1726        Modeling Language" were included in the distribution.
1727
1728        * java-binding/*.*
1729        The package GLPK JNI (Java Native Interface) implementing Java
1730        binding for GLPK was included in the distribution. This package
1731        was developed and programmed by Yuri Victorovich <yuri@gjt.org>.
1732
1733Tue Feb 18 12:00:00 2003 Andrew Makhorin <mao@mai2.rcnet.ru>
1734
1735        * GLPK 3.2.4 has been released.
1736
1737        * glplpx6b.c
1738        The code was changed to allow auxiliary variables have non-zero
1739        objective coefficients.
1740
1741        Also a minor bug was fixed (the constant term was not considered
1742        on displaying the objective function value).
1743
1744        * sample/glpsol.c
1745        The code was changed to fix a bug (the command-line option 'bfs'
1746        was not recognized). The bug was fixed due to report provided by
1747        Olivier <odwl@skynet.be>.
1748
1749        * glplpt.c
1750        The code was changed to fix a bug (binary variables were treated
1751        erroneously as integer ones).
1752
1753        * glplpx6b.c
1754        The code was changed to fix a bug (variables that have no lower
1755        bounds were incorrectly processed on converting to the standard
1756        formulation). The bug was fixed due to report kindly provided by
1757        Kjell Eikland <kjell.eikland@broadpark.no>.
1758
1759Mon Nov 11 12:00:00 2002 Andrew Makhorin <mao@mai2.rcnet.ru>
1760
1761        * GLPK 3.2.3 has been released.
1762
1763        * glpmip.h, glpmip1.c
1764        A preliminary implementation of the branch-and-bound driver
1765        based on the implicit enumeration suite (glpies) was added to
1766        the package. This module is not documented yet.
1767
1768        * glplpx6c.c
1769        A new implementation of the api routine lpx_integer which now
1770        is based on the b&b driver (see glpmip above) was included in
1771        the package. This new implementation has exactly the same
1772        functionality as the old version and therefore all changes are
1773        transparent to the api user.
1774
1775        * glpbbm.h, glpbbm.c
1776        * glprsm.h, glprsm1.c, glprsm2.c
1777        * glplp.h, glplp.c
1778        These modules were removed from the package, because they were
1779        used only in the old version of the routine lpx_integer, which
1780        was replaced by the new version (see glplpx6c above).
1781
1782        * glplpx.h, glplpx6a.c
1783        The api routine lpx_check_kkt was included in the package and
1784        its description was added in the reference manual. This routine
1785        allows checking Karush-Kuhn-Tucker optimality conditions for an
1786        LP solution.
1787
1788        * glplpx.h, glplpx8a.c
1789        Now the api routine lpx_print_sol also prints information about
1790        "solution quality" obtained via the api routine lpx_check_kkt.
1791
1792        * glplpx.h, glplpx8a.c
1793        New api routines lpx_read_bas and lpx_write_bas were included
1794        in the package and documented. The routine lpx_write_bas allows
1795        writing a current basis from an LP object to a text file in the
1796        MPS format. The routine lpx_read_bas allows reading a basis
1797        prepared in the MPS format from a text file into an LP object.
1798
1799        * glplpt.c
1800        The parsing routine which reads LP problem data prepared in the
1801        CPLEX LP format was modified to allow specifying lower bounds
1802        of variables also in the form 'variable >= lower bound' (in the
1803        bounds section). This modification was made due to a notice
1804        provided by Ivan Luzzi <iluzzi@libero.it>.
1805
1806        * glplpx.h, glplpx8c.c
1807        The api routine lpx_write_lpt which allows writing LP problem
1808        data from an LP object to a text file using the CPLEX LP format
1809        was included in the package and documented.
1810
1811        * glplpx.h, glplpx3.c
1812        The control parameter LPX_K_LPTORIG that affects the behavior
1813        of the api routine lpx_write_lpt was introduced.
1814
1815        * glplan6.c
1816        The semantics of the language GLPK/L was changed to allow
1817        selection in case when not all mute letters of a predicate (the
1818        operand that follows the keyword 'where') are presented in a
1819        parameter (the operand that precedes the keyword 'where'), i.e.
1820        to allow writing something like this:
1821            y[j] := sum(i, x[i] where p[i,j]);
1822        The paragraph "Selection" in the langauge description (page 25)
1823        was also correspondingly changed. This change of the language
1824        semantics was undertaken due to a notice provided by Peter Lee
1825        <plee@kinggee.com.au>.
1826
1827        * sample/hwd.lpm
1828        A nice example of LP model written in GLPK/L and contributed by
1829        Peter Lee <plee@kinggee.com.au> was included in the package.
1830
1831        * glplpx6b.c
1832        The api routine lpx_interior was modified: a) to compute dual
1833        values for all structural as well as auxiliary variables; b) to
1834        allow specifying non-zero objective coefficients at auxiliary
1835        variables.
1836
1837        * sample/glpsol.c
1838        Three new command-line options were added to the solver, which
1839        are: --plain, --orig, and --wrlpt.
1840
1841Mon Oct 14 12:00:00 2002 Andrew Makhorin <mao@mai2.rcnet.ru>
1842
1843        * GLPK 3.2.2 has been released.
1844
1845        * glplpt.h, glplpt.c
1846        A module that reads LP/MIP problem data in CPLEX LP format was
1847        implemented.
1848
1849        * glplpx8c.c
1850        An api routine lpx_read_lpt that reads LP/MIP problem data in
1851        CPLEX LP format was implemented.
1852
1853        * sample/glpsol.c, sample/plan.lpt
1854        A new command-line option '--lpt' that allows reading LP/MIP
1855        problem data in CPLEX LP format was added to the solver.
1856
1857        * doc/refman.latex, doc/refman.dvi, doc/refman.ps
1858        A new edition of the Reference Manual was included.
1859
1860        * source/*.c
1861        Casting to (unsigned char) was added in some calls to the
1862        classification functions (isalpha, etc.). The bug was fixed due
1863        to report provided by Morten Welinder <terra@diku.dk>.
1864
1865        * glplpx8a.c
1866        The local routine mps_numb used in the routine lpx_write_mps
1867        was modified to correctly format floating-point numbers that
1868        have two digits in the decimal exponent. The bug was fixed due
1869        to report provided by Vlahos Kiriakos <Kiriakos.Vlahos@gs.com>.
1870
1871        * glplan.h, glplan1.c, ..., glplan8.c
1872        Several serious bugs were fixed in the language processor due
1873        to reports provided by <NORBERT.PIOTROWSKI@LHSYSTEMS.COM>:
1874        (a) a static search tree used to find sparse array elements was
1875        sometimes overwritten that caused the message 'assertion failed'
1876        to appear; the bug was fixed by creating separate search trees
1877        in parsing routines; (b) a variable declared using the
1878        predicate-controlled variable declaration statement had wrong
1879        order of domain sets, because the variable array was built as
1880        a copy of the predicate array; the bug was fixed by using the
1881        internal routine transpose that coordinates mute letters (and
1882        therefore domain sets) on copying sparse arrays; (c) sometimes
1883        assignment statements like x[#a,#b,#c] := ... was incorrectly
1884        processed; the bug was fixed by including an appropriate check
1885        into the internal routine assign_stmt.
1886
1887        * glp_simplex.c
1888        An additional check to see if all lower bounds are not greater
1889        than corresponding upper bounds was included in the routine to
1890        prevent wrong results to appear. Such incorrectness sometimes
1891        was not detected, namely, when variables with such bounds were
1892        non-basic and never entered the basis.
1893
1894        * glpspx1.c
1895        Maximal number of simplex iterations before reinversion was
1896        decreased from 100 to 50. This allowed to improve accuracy and,
1897        that is more important, to reduce the solution time for many
1898        serial lp problems approximately 1.5--2 times.
1899
1900        * glpspx2.c
1901        A check to see if all elements in the column chosen to enter
1902        the basis are close to zero in the routine spx_prim_chuzr was
1903        temporarily removed because this check gave wrong conclusion in
1904        case when the corresponding non-basic variable had zero column
1905        in the constraint matrix. An analogous check to see if all
1906        elements in the row chosen to leave the basis are close to zero
1907        in the routine spx_dual_chuzc was also temporarily removed on
1908        the same reason. The bug was fixed due to reports provided by
1909        Flavio Keidi Miyazawa <fkm@ic.unicamp.br> and Vlahos Kiriakos
1910        <Kiriakos.Vlahos@gs.com>.
1911
1912Mon Aug 12 12:00:00 2002 Andrew Makhorin <mao@mai2.rcnet.ru>
1913
1914        * GLPK 3.2.1 has been released.
1915
1916        * glpbcs.h, glpbcs1.c, glpbcs2.c
1917        * glpies.h, glpies1.c, glpies2.c, glpies3.c
1918        A preliminary implementation of the branch-and-cut framework
1919        was included in the package.
1920
1921        * doc/brcut.txt
1922        The document "GLPK: A Preliminary Implementation of the
1923        Branch-And-Cut Framework" was included in the distribution.
1924
1925        * sample/tspsol.c
1926        An illustrative program for solving symmetric TSP based on the
1927        branch-and-cut method was included in the package.
1928
1929        * glpdmp.h, glpdmp.c
1930        A new, re-enterable version of routines for managing dynamic
1931        memory pools was included in the package.
1932
1933        * glpavl.h, glpavl.c
1934        A new, re-enterable version of routines for managing AVL search
1935        trees was included in the package.
1936
1937        * glplib.h, glplib2.c
1938        Two new low-level routines ufopen and ufclose were included in
1939        the package.
1940
1941        * glplpx.h, glplpx7.c
1942        The following new api routines were added: lpx_eval_activity,
1943        lpx_eval_red_cost, lpx_reduce_form, lpx_mixed_gomory.
1944
1945        * glptsp.h, glptsp.c
1946        A module for reading TSP data using TSPLIB format was included
1947        in the package.
1948
1949Mon Jul 15 12:00:00 2002 Andrew Makhorin <mao@mai2.rcnet.ru>
1950
1951        * GLPK 3.2 has been released.
1952
1953        * glplpx.h, glplpx1.c, glplpx2.c
1954        The identifier 'class' (used as a member name in the structure
1955        LPX and as an argument name in the routine lpx_set_class) was
1956        changed to 'clss' in order to avoid conflicts with C++ reserved
1957        words.
1958
1959        * glpk.h, glplpx.h, glplpx1.c, glplpx2.c, glplpx6a.c,
1960        * glplpx6b.c, glplpx6c.c, glplpx7.c, glplpx8.c
1961        The following new api routines were added: lpx_set_obj_name,
1962        lpx_get_obj_name, lpx_get_row_mark, lpx_get_col_mark,
1963        lpx_transform_row, lpx_transform_col, lpx_prim_ratio_test,
1964        lpx_dual_ratio_test, lpx_interior, lpx_get_ips_stat,
1965        lpx_get_ips_row, lpx_get_ips_col, lpx_get_ips_obj, lpx_read_lpm,
1966        lpx_write_mps, lpx_print_ips.
1967
1968        * glpsol.c
1969        The solver was completely re-programmed using new api routines.
1970
1971        * lang.latex, lang.dvi, lang.ps
1972        New edition of the document "GLPK: Modeling Language GLPK/L"
1973        was included in the distribution.
1974
1975        * refman.latex, refman.dvi, refman.ps
1976        New edition of the document "GLPK: Reference Manual" (which
1977        contains descriptions of all new api routines) was included in
1978        the distribution.
1979
1980        * glpapi.h, glpapi1.c, glpapi2.c, glpapi3.c, glpapi4.c
1981        These files (which contain old api routines) were removed from
1982        the package.
1983
1984        * glpipm1.c, glpipm2.c
1985        The file glpipm1.c was renamed to glpipm.c. The file glpipm2.c
1986        was used only by old api routines and therefore was removed from
1987        the package.
1988
1989        * language.texinfo
1990        Old version of the document "GLPK: Modeling Language GLPK/L" was
1991        removed from the distribution.
1992
1993Mon May 27 12:00:00 2002 Andrew Makhorin <mao@mai2.rcnet.ru>
1994
1995        * GLPK 3.1 has been released.
1996
1997        * glplpx.h, glplpx1.c, glplpx2.c, glplpx3.c, glplpx4.c,
1998        * glplpx5.c, glplpx6.c, glplpx7.c, glplpx8.c
1999        A preliminary implementation of new API routines was completed.
2000
2001        * refman.latex, refman.dvi, refman.ps
2002        A draft edition of the document "GLPK Reference Manual", which
2003        describes new API routines, was included.
2004
2005        * glplib3.c
2006        A bug in measuring long time intervals was fixed up.
2007
2008        * glprsm3.c
2009        This module contains some obsolete routines not longer used and
2010        therefore it was removed from the package (into the subdirectory
2011        'oldsrc').
2012
2013        * glprsm.h
2014        Some declarations related to the module 'glprsm3.c' (see above)
2015        were removed.
2016
2017        * guide.texinfo
2018        The document "GLPK User's Guide" describing old API routines was
2019        removed from the package (into the subdirectory 'oldsrc').
2020
2021        * newapi.txt
2022        The document "New GLPK API Routines" was removed at all, because
2023        it is superseded by the new reference manual (see above).
2024
2025Mon May 13 12:00:00 2002 Andrew Makhorin <mao@mai2.rcnet.ru>
2026
2027        * GLPK 3.0.8 has been released.
2028
2029        * glplpx.h, glplpx1.c, glplpx2.c, glplpx3.c, glplpx4.c,
2030        * glplpx5.c, glplpx6.c, glplpx7.c
2031        A preliminary (currently incomplete) implementation of new api
2032        routines was included.
2033
2034        * sample/newsamp.c
2035        A sample program for the new api routines was included.
2036
2037        * newapi.txt
2038        A draft of the document "New GLPK API Routines" was included.
2039
2040        * glpapi2.c, glpapi5.c, glpapi6.c
2041        These modules (which contain the api routines glp_call_rsm1,
2042        glp_simplex1, glp_pivot_in, glp_pivot_out) were removed from the
2043        package (to the subdirectory 'oldsrc') since these routines are
2044        functionally superseded by the new api routines.
2045
2046        * glpk.h, glpapi2.c, glpapi3.c, glpapi4.c
2047        The api routines glp_simplex2, glp_call_ipm1, glp_call_bbm1 were
2048        renamed to glp_simplex, glp_interior, glp_integer, respectively.
2049
2050        * sample/glpsol.c
2051        Some command-line options (which got obsolete due to the recent
2052        changes in api) were excluded.
2053
2054        * doc/guide.texinfo
2055        New edition of the document "GLPK User's Guide" was included in
2056        the distribution to reflect the changes in some api routines.
2057
2058        * doc/libref.texinfo
2059        This document was removed from the package (to the subdirectory
2060        'oldsrc') since it describes the library routines, most of which
2061        got obsolete and no longer used.
2062
2063        * Makefile.in
2064        A minor bug was fixed up due to bug report from Hans Schwengeler
2065        <Hans.Schwengeler@unibas.ch>.
2066
2067Mon Apr 22 12:00:00 2002 Andrew Makhorin <mao@mai2.rcnet.ru>
2068
2069        * GLPK 3.0.7 has been released.
2070
2071        * glpduff.h, glpduff.c, glpspx.h, glpspx1.c, glpspx2.c,
2072        * glpapi7.c
2073        These modules were replaced by a new implementation of the
2074        simplex method and therefore they were removed from the package
2075        (however they still can be found in the subdirectory 'oldsrc').
2076
2077        * glprsm1.c
2078        The routine crash_aa was replaced by a new implementation and
2079        therefore it was removed from the file 'glprsm1.c'.
2080
2081        * glplpx.h, glplpx.c, glpspx.h, glpspx1.c, glpspx2.c, glpspx3.c,
2082        * glpspx4.c, glpapi7.c
2083        New (currently incomplete) implementation of the simplex method
2084        components was included in the package.
2085
2086Thu Mar 28 12:00:00 2002 Andrew Makhorin <mao@mai2.rcnet.ru>
2087
2088        * GLPK 3.0.6 has been released.
2089
2090        * glpluf.h, glpluf.c, glpinv.h, glpinv.c
2091        New version of LU-factorization and basis maintenance routines
2092        (based on Forrest-Tomlin updating technique) was implemented.
2093
2094        * glpeta.h, glpeta.c, glpfhv.h, glpfhv.c, glpgel.h, glpgel.c,
2095        * glppfi.h, glppfi.c, glprfi.h, glprfi.c
2096        These routines implement some other forms of the basis matrix.
2097        Now they became obsolete being functionally superseded by the
2098        new version of basis maintenance routines (see above) and were
2099        removed from the package (however they still can be found in the
2100        subdirectory 'oldsrc').
2101
2102        * glpbbm.c, glprsm.h, glprsm1.h, glprsm2.h, glpspx.h, glpspx2.c,
2103        * glprsm2.c, glpsol.c
2104        Necessary changes were made in order to use the new version of
2105        basis maintenance routines.
2106
2107Tue Jan 29 12:00:00 2002 Andrew Makhorin <mao@mai2.rcnet.ru>
2108
2109        * GLPK 3.0.5 has been released.
2110        Structure of the package was re-organized in order to simplify
2111        its maintenance.
2112
2113        * doc/guide.texinfo
2114        New edition of the document "GLPK User's Guide" was included in
2115        the distribution. Now the document includes descriptions of some
2116        additional API routines recently added to the package.
2117
2118        * doc/newapi.txt
2119        The document "Additional GLPK API Routines" was removed from the
2120        distribution, because the corresponding material was included in
2121        the user's guide (see above).
2122
2123Mon Dec 10 12:00:00 2001 Andrew Makhorin <mao@mai2.rcnet.ru>
2124
2125        * GLPK 3.0.4 has been released.
2126
2127        * glpspx.h, glpspx1.c, glpspx2.c, glpapi/glp_simplex2.h
2128        A new, more efficient version of the two-phase primal simplex
2129        method was implemented (advanced initial basis, projected
2130        steepest edge, recursive computations of solution components).
2131
2132        * glpapi/glp_call_bbm1.c
2133        Now LP relaxation can be solved either using rsm1_driver(), or
2134        using glp_simplex2(). The choice is controlled by the parameter
2135        'meth' (a member of struct bbm1).
2136
2137        * sample/glpsol.c
2138        The new implementation of the simplex method is now used by
2139        default. The old version is available via --old-sim option.
2140
2141        * glpmat/gm_scaling.c
2142        Now this routine displays only two lines: an initial "quality"
2143        and a final "quality".
2144
2145        * glplp/prepro_lp.c
2146        Identifiers 'fmin' and 'fmax' renamed to 'f_min' and 'f_max' in
2147        order to avoid conflict with <math.h>. The bug was fixed due to
2148        report provided by Sami Farin <sfarin@ratol.fi>.
2149
2150Wed Oct 03 12:00:00 2001 Andrew Makhorin <mao@mai2.rcnet.ru>
2151
2152        * GLPK 3.0.3 has been released.
2153
2154        * glprsm/harris_row.c, glprsm/harris_col.c
2155        The relative tolerance used on the first pass of the two-pass
2156        ratio test was replaced by the absolute tolerance.
2157
2158        * glprsm/rsm_primal.c, glprsm/rsm_feas.c, glprsm/rsm_dual.c
2159        The absolute tolerance passed to the two-pass ratio test routine
2160        was decaresed (for both primal and dual simplex).
2161
2162        These changes were made in order to improve numerical stability
2163        of the simplex method.
2164
2165        * glprsm/glp_call_rsm1.c, glprsm/glp_call_bbm1.c,
2166        * glprsm/glp_simplex1, glprsm/glp_pivoting.c
2167        Default form of the inverse was changed from RFI to AFI.
2168
2169Mon Sep 24 12:00:00 2001 Andrew Makhorin <mao@mai2.rcnet.ru>
2170
2171        * GLPK 3.0.2 has been released.
2172
2173        * glpfhv.h, glpfhv.c
2174        New version of the basis maintaining routines was implemented.
2175        These routines, which are based on so called FHV-factorization
2176        (a variety of LU-factorization) and Gustavson's data structures,
2177        perform the main operations on the basis matrix faster at the
2178        expense of some worsening numerical accuracy.
2179
2180        * glprsm.h, glprsm/afi.c
2181        The routines, which implement AFI (Advanced Form of the
2182        Inverse) based on FHV-factorization, were added to the package.
2183        This new form is available via the parameter form = 3 (on API
2184        level) or via the option --afi (in GLPSOL solver).
2185
2186        * EFI was renamed to PFI
2187        In order to correct terminology the acronym EFI (Elimination
2188        Form of the Inverse) was replaced by PFI (Product Form of the
2189        Inverse) everywhere in the source code and the documentation.
2190
2191        * glpset/umalloc.c, glpset/ucalloc.c
2192        * glpset/get_atom.c, glpset/get_atomv.c
2193        These memory management routines were changed in order *not* to
2194        clear allocated memory blocks by binary zeros.
2195
2196Wed Aug 01 12:00:00 2001 Andrew Makhorin <mao@mai2.rcnet.ru>
2197
2198        * GLPK 3.0.1 has been released.
2199
2200        * glpapi/old_api.c, glplp/extract_lp.c, store_lpsol.c
2201        Old API routines were deleted from the package.
2202
2203        * include/glpk.h, include/glpapi.h, include/glplp.h
2204        Specifications of old API routines and data structures were
2205        removed from the headers.
2206
2207        * sample/glpsol.c
2208        New version of the stand-alone solver GLPSOL that now uses new
2209        API routines was implemented.
2210
2211        * glpapi/glp_set_row_fctr.c, glpapi/glp_set_col_fctr.c,
2212        * glpapi/glp_get_row_fctr.c, glpapi/glp_get_col_fctr.c,
2213        * glpapi/glp_scale_prob.c
2214        Scaling routines were added.
2215
2216        * glpapi/glp_write_mps.c
2217        The routine for writing problem data in MPS format was added.
2218
2219        * glpapi/glp_simplex1.c
2220        Comprehensive driver to the simplex method was added.
2221
2222        * glpapi/glp_pivoting.c
2223        The routines glp_pivot_in() and glp_pivot_out() intended for
2224        basis maintaining were added.
2225
2226        * glprsm/create_rsm.c, glprsm/delete_rsm.c, glprsm/scale_rsm.c,
2227        * glprsm/build_basis.c
2228        Additional low level routines related to the simplex method
2229        were added.
2230
2231        * glpk.h, glpapi.h, glprsm.h
2232        Additional specifications for new routines and data structures
2233        were added.
2234
2235        * sample/lpglpk30.c
2236        A non-trivial example was added. It allows using GLPK as a base
2237        LP solver for Concorde, a program for solving Traveling Salesman
2238        Problem (TSP). For details see comments in 'lpglpk30.c'.
2239
2240        * doc/newapi.txt
2241        The document "Additional GLPK API Routines" that describes some
2242        new API routines was included.
2243
2244Thu Jul 19 12:00:00 2001 Andrew Makhorin <mao@mai2.rcnet.ru>
2245
2246        * GLPK 3.0 has been released.
2247
2248        Now GLPK is provided with new API, which is intended for using
2249        the package in more complex algorithmic schemes.
2250
2251        * glpapi/old_api.c
2252        All routines related to old API were gathered in one file named
2253        'old_api.c'.
2254
2255        * glpapi/*.c
2256        These routines that implement new API were added to the package.
2257
2258        * include/glpk.h, include/glpapi.h
2259        Specifications of new API routines and data structures were
2260        added to these headers. Specifications of old API routines and
2261        data structures were locked by #ifdef GLP_OLD_API directive.
2262
2263        * doc/guide.texinfo
2264        New edition of the document "GLPK User's Guide" that correspond
2265        to new API was included.
2266
2267Thu Jun 14 12:00:00 2001 Andrew Makhorin <mao@mai2.rcnet.ru>
2268
2269        * GLPK 2.4.1 has been released.
2270
2271        * doc/glpk_ml.texinfo
2272        The new document "Modeling Language GLPK/L" was included.
2273
2274        * doc/glpk_ug.texinfo
2275        New edition of the document "GLPK User's Guide" was included.
2276
2277        * doc/language.txt
2278        The preliminary document "GLPK/L Modeling Language: A Brief
2279        description" was removed from the distribution, because it has
2280        been replaced by the new document "Modeling Language GLPK/L".
2281
2282        * glplang/l_spar.c
2283        The routine comparison() was re-programmed in order to
2284        implement the relation operation as specified in the language
2285        description.
2286
2287        * glpmip.h, glpmip/*.c
2288        The partition 'glpmip' was renamed to 'glpbbm'.
2289
2290Thu May 10 12:00:00 2001 Andrew Makhorin <mao@mai2.rcnet.ru>
2291
2292        * GLPK 2.4 has been released.
2293
2294        Now GLPK includes an implementation of a preliminary version of
2295        the GLPK/L modeling language.
2296
2297        * glplang.h, glplang/*.c
2298        The header 'glplang.h' and a set of routines that implements
2299        the GLPK/L language processor (the partition 'glplang') were
2300        added to the package.
2301
2302        * doc/language.txt
2303        The document "GLPK/L Modeling Language: A Brief Description
2304        (Supplement to GLPK User's Guide)" in plain text format was
2305        included in the package (see the file 'language.txt' in the
2306        subdirectory 'doc' of the distribution).
2307
2308        * ex/model1.lpm, ex/model2.lpm
2309        Two examples of model descriptions written in GLPK/L were added
2310        to the package.
2311
2312        * sample/glpsol.c
2313        This program was modified in order: a) to allow processing
2314        model description written in GLPK/L; b) to allow solving pure
2315        LP problem using the interior point method.
2316
2317        * sample/glpipm.c
2318        This program was removed from the package, because its function
2319        was passed to the GLPSOL solver.
2320
2321        * Makefile.in
2322        This file was changed in order to install the GLPSOL solver
2323        executable.
2324
2325Mon Apr 09 12:00:00 2001 Andrew Makhorin <mao@mai2.rcnet.ru>
2326
2327        * GLPK 2.3 has been released.
2328
2329        * glpmip.h, glpmip/*.c
2330        These routines (that implement the branch-and-bound method) were
2331        re-programmed in order to improve robustness of implementation.
2332        In particular, heuristic routines were carried out from the main
2333        driver routine.
2334
2335        Additional GLPK API routines were documented.
2336
2337        New edition of the document "GLPK User's Guide" was included in
2338        the package.
2339
2340        The preliminary document "Mixed Integer Programming Using GLPK
2341        Version 2.2 (Supplement to GLPK User's Guide)" was removed from
2342        the package, because this material was included in GLPK User's
2343        Guide.
2344
2345Thu Mar 15 12:00:00 2001 Andrew Makhorin <mao@mai2.rcnet.ru>
2346
2347        * GLPK 2.2 has been released.
2348
2349        Now GLPK includes a tentative implementation of the
2350        branch-and-bound procedure based on the dual simplex method for
2351        mixed integer linear programming (MIP).
2352
2353        The preliminary document "Mixed Integer Programming Using GLPK
2354        Version 2.2 (Supplement to GLPK User's Guide)" was included into
2355        the package in plain text format (see the file 'mip.txt' in the
2356        subdirectory 'doc' of the distribution).
2357
2358        * glpmip.h, glpmip/*.c, glpapi/glp_integer.c
2359        These routines (that implement the branch-and-bound method) were
2360        added to the package.
2361
2362        * sample/glpsol.c
2363        This program was modified in order to allow solving LP and MIP
2364        problems.
2365
2366        * glprsm/rsm_primal.c, glprsm/rsm_dual.c, glprsm/rsm_feas.c,
2367        * glprsm/rsm1_driver.c
2368        These routines (which are drivers to basic components of the
2369        revised simplex method) were added to the package.
2370
2371Mon Feb 19 12:00:00 2001 Andrew Makhorin <mao@mai2.rcnet.ru>
2372
2373        * GLPK 2.1 has been released.
2374
2375        * glprsm.h, glprsm/*.c
2376        These routines (that implement components of the revised simplex
2377        method) were re-programmed and documented.
2378
2379        The document "GLPK Implementation of the Revised Simplex Method"
2380        was included into the package.
2381
2382Thu Jan 25 12:00:00 2001 Andrew Makhorin <mao@mai2.rcnet.ru>
2383
2384        * GLPK 2.0 has been released.
2385
2386        Now GLPK includes a tentative implementation of the primal-dual
2387        interior point method for large-scale linear programming (for
2388        more details see the file `NEWS' in the distribution). A number
2389        of routines related to the interior point method were added to
2390        the package.
2391
2392        * insist.c
2393        The routine `insist' and the macro of the same name were
2394        introduced into the package in order to replace the standard
2395        macro `assert'. Some routines require the expression specified
2396        in the `assert' macro to be evaluated, but compiling the package
2397        with NDEBUG option prevents from that. This bug was fixed due to
2398        bug report provided by Peter A. Huegler <phuegler@bsco.com>.
2399
2400        * Makefile.in
2401        Minor bug was fixed due to a patch provided by Alexandre Oliva
2402        <oliva@lsd.ic.unicamp.br>.
2403
2404Wed Jan 10 12:00:00 2001 Andrew Makhorin <mao@mai2.rcnet.ru>
2405
2406        * GLPK 1.1.2 has been released.
2407
2408        * umalloc.c, ufree.c, create_pool.c, get_atom.c, get_atomv.c
2409        These routines were changed in order to fix a bug due to
2410        report provided by Andrew Hood <ajhood@fl.net.au>. Because of
2411        this bug data alignment error occured on the Sparc computer.
2412
2413Tue Dec 14 12:00:00 2000 Andrew Makhorin <mao@mai2.rcnet.ru>
2414
2415        * GLPK 1.1.1 has been released.
2416
2417        Minor bug was fixed in `Makefile.in'.
2418
2419        GLPK Library Reference was included.
2420
2421Mon Nov 27 12:00:00 2000 Andrew Makhorin <mao@mai2.rcnet.ru>
2422
2423        * GLPK 1.1 has been released.
2424
2425        Minor changes were made in order to co-ordinate GLPK routines
2426        and their descriptions.
2427
2428        GLPK User's Guide was included.
2429
2430Fri Oct 20 12:00:00 2000 Andrew Makhorin <mao@mai2.rcnet.ru>
2431
2432        * GLPK 1.0 has been released.
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