alpar@1: Sun Dec 05 12:00:00 2010 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.45 (30:0:30) has been released alpar@1: alpar@1: * glplpx01.c alpar@1: A bug (it_cnt) in routine reset_parms was fixed. alpar@1: Thanks to Ali Baharev for report. alpar@1: alpar@1: * glpmpl03.c alpar@1: A bug (print "text\") was fixed. alpar@1: Thanks to Xypron for report. alpar@1: alpar@1: * glpsql.c alpar@1: A precision bug was fixed. alpar@1: Thanks to Xypron . alpar@1: alpar@1: * glpk.tex alpar@1: Some typos were corrected. alpar@1: Thanks to Robbie Morrison . alpar@1: alpar@1: Thu Jun 03 12:00:00 2010 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.44 (29:0:29) has been released alpar@1: alpar@1: * glpapi14.c glpmpl.h glpmpl01.c glpmpl03.c glpmpl04.c alpar@1: Implemented suffixes for variables and constraints. alpar@1: alpar@1: * glpmpl06.c alpar@1: Made changes to allow comment records in CSV files. alpar@1: alpar@1: * glpapi17.c alpar@1: Added and documented new API routine glp_cpp to solve Critical alpar@1: Path Problem. alpar@1: alpar@1: Sat Feb 20 12:00:00 2010 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.43 (28:0:28) has been released alpar@1: alpar@1: * glplib.h, glplib.c, glpenv.h, glpenv.c alpar@1: The module glpenv was split into two modules glpenv and glplib. alpar@1: alpar@1: * glpenv01.c, glpenv03.c, glpenv04.c, glpenv06.c alpar@1: The following new API routines were added and documented: alpar@1: glp_init_env, glp_free_env, glp_open_tee, glp_close_tee, alpar@1: glp_error (macro), glp_difftime. alpar@1: alpar@1: * glpapi16.c alpar@1: New API routine glp_top_sort (topological sorting of ayclic alpar@1: digraph) was added and documented. alpar@1: alpar@1: * glpapi17.c alpar@1: A serious bug was fixed in the routine glp_asn_prob_hall. alpar@1: alpar@1: * glpnpp05.c alpar@1: A bug was fixed in the LP/MIP preprocessor (hidden covering alpar@1: inequalities). alpar@1: alpar@1: * glpsql.c alpar@1: Some improvements were made in the table driver (NULL data). alpar@1: Thanks to Xypron for contribution. alpar@1: alpar@1: * configure.ac alpar@1: Changes were made to use .dylib rather than .so under Mac OS. alpar@1: Thanks to Noli Sicad for testing alpar@1: alpar@1: Wed Jan 13 12:00:00 2010 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.42 (27:0:27) has been released alpar@1: alpar@1: * glpapi01.c, glpapi11.c, glpapi12.c, glpdmx.c alpar@1: The following new API routines were added and documented: alpar@1: glp_check_dup (check for duplicate elements in sparse matrix); alpar@1: glp_sort_matrix (sort elements of the constraint matrix); alpar@1: glp_read_prob (read problem data in GLPK format); alpar@1: glp_write_prob (write problem data in GLPK format); alpar@1: glp_analyze_bound (analyze active bound of non-basic variable); alpar@1: glp_analyze_coef (analyze obj. coefficient at basic variable); alpar@1: glp_print_ranges (print sensitivity analysis report; replaces alpar@1: lpx_print_sens_bnds). alpar@1: alpar@1: * glpapi20.c alpar@1: New command-line options were added to glpsol: alpar@1: --glp (read problem data in GLPK format); alpar@1: --wglp (write problem data in GLPK format); alpar@1: --lp (replaces --cpxlp); alpar@1: --wlp (replaces --wcpxlp); alpar@1: --ranges (print sensitivity analysis report). alpar@1: alpar@1: * glpapi06.c alpar@1: In the routine glp_init_smcp default value of the parameter alpar@1: out_frq was changed to 500 (it was 200). alpar@1: alpar@1: * glpipp.h, glpipp01.c, glpipp02.c alpar@1: The old MIP preprocessor module was removed. alpar@1: alpar@1: * glpapi09.c alpar@1: Now the MIP solver uses the new MIP preprocessor (NPP). alpar@1: alpar@1: * glplpx03.c alpar@1: lpx_write_opb was disabled due to replacing IPP with NPP. alpar@1: alpar@1: * glpnet09.c alpar@1: Kellerman's heuristic to cover edges by cliques was added. alpar@1: alpar@1: * glplib08.c alpar@1: Recognition of special filenames "/dev/stdin", "/dev/stdout", alpar@1: and "/dev/stderr" was added. alpar@1: alpar@1: * glpk.tex alpar@1: Chapter "Graph and network routines" was carried out from the alpar@1: reference manual as a separate document. alpar@1: alpar@1: Mon Dec 21 12:00:00 2009 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.41 (26:0:26) has been released alpar@1: alpar@1: * glpapi12.c alpar@1: The following new API routines were added: alpar@1: glp_transform_row (replaces lpx_transform_row); alpar@1: glp_transform_col (replaces lpx_transform_col); alpar@1: glp_prim_rtest (replaces lpx_prim_ratio_test); alpar@1: glp_dual_rtest (replaces lpx_dual_ratio_test). alpar@1: Note that values returned by glp_prim_rtest and glp_dual_rtest alpar@1: differ from the ones retutned by the deprecated routines. alpar@1: alpar@1: * glpnpp*.* alpar@1: The LP/MIP preprocessor was essentially re-implemented. alpar@1: alpar@1: * glpios03.c alpar@1: The feature to remove inactive cuts from the active subproblem alpar@1: was implemented. alpar@1: alpar@1: * glpios11.c alpar@1: The feature processing cuts stored in the cut pool was improved alpar@1: (now it uses estimation of objective degradation). alpar@1: alpar@1: * glpscg.* alpar@1: Obsolete implemetation of the conflict graph was removed. alpar@1: alpar@1: * glpmpl.h, glpmpl03.c, glpmpl04.c alpar@1: FILE was replaced by XFILE to allow using GLPK I/O routines. alpar@1: alpar@1: * glpsql.c, examples/sql, doc/tables.tex alpar@1: The SQL table driver was changed to allow multiple arguments alpar@1: separated by semicolon in SQL statements. Thanks to Xypron alpar@1: . alpar@1: alpar@1: * glpk.h, glpapi14.c alpar@1: New API routine glp_time was added (not documented yet). alpar@1: alpar@1: * glpapi20.c alpar@1: Two new options were added to glpsol: --seed value (initialize alpar@1: pseudo-random number generator used in MathProg model with alpar@1: specified seed value), and --ini filename (use as initial basis alpar@1: previously saved with -w option). alpar@1: alpar@1: * examples/xyacfs.mod alpar@1: Thanks to Nigel Galloway for alpar@1: contribution. alpar@1: alpar@1: * examples/dbf/*.* alpar@1: Thanks to Noli Sicad for contribution. alpar@1: alpar@1: * w32/*.*, w64/*.* alpar@1: Scripts to build GLPK with Microsoft Visual Studio 2010 were alpar@1: added. Thanks to Xypron for contribution alpar@1: and testing. alpar@1: alpar@1: Tue Nov 03 12:00:00 2009 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.40 (25:0:25) has been released alpar@1: alpar@1: * glpdmx.c alpar@1: Two new API routines were added: alpar@1: glp_read_ccdata (read graph in DIMACS clique/coloring format); alpar@1: glp_write_ccdata (write graph in DIMACS clique/coloring format). alpar@1: Also an example file examples/sample.col was added. alpar@1: alpar@1: * glpapi19.c, glpnet08.c alpar@1: New API routine glp_wclique_exact was added. It is intended to alpar@1: find a maximum weight clique with the exact algorithm developed alpar@1: by Prof. P. Ostergard. alpar@1: alpar@1: * glpnpp02.c alpar@1: A bug was fixed in the LP preprocessor (routine npp_empty_col). alpar@1: Thanks to Stefan Vigerske for the alpar@1: bug report. alpar@1: alpar@1: * glpios10.c alpar@1: A bug was fixed and some improvements were made in the FPUMP alpar@1: heuristic module. Thanks to Xypron . alpar@1: alpar@1: * glpapi12.c alpar@1: A bug was fixed in the API routine glp_warm_up (dual alpar@1: feasibility test was incorrect in maximization case). Thanks to alpar@1: Uday Venkatadri for the bug report. alpar@1: alpar@1: * glpapi16.c alpar@1: Two new API routines were added: alpar@1: glp_del_vertices (remove vertices from graph); alpar@1: glp_del_arc (remove arc from graph). alpar@1: alpar@1: * glpios09.c alpar@1: The hybrid pseudocost branching heuristic was included in the alpar@1: MIP solver. It is available on API level (iocp.br_tech should alpar@1: be set to GLP_BR_PCH) and in the stand-alone solver glpsol alpar@1: (via the command-line option --pcost). This heuristic may be alpar@1: useful on solving hard MIP instances. alpar@1: alpar@1: * glpios03.c alpar@1: The branching heuristic by Driebeck and Tomlin (used in the alpar@1: MIP solver by default) was changed to switch to branching on alpar@1: most fractional variable if an lower bound of degradation of alpar@1: the objective is close to zero for all branching candidates. alpar@1: alpar@1: Sun Jul 26 12:00:00 2009 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.39 (24:0:24) has been released alpar@1: alpar@1: * glpsdf.c alpar@1: New API routines to read plain data files were added. alpar@1: alpar@1: * glpcpx.h, glpini.h, glpscl.h alpar@1: These headers were removed. alpar@1: alpar@1: * glpcpx.c alpar@1: API routines glp_read_lp and glp_write_lp to read/write files alpar@1: in CPLEX LP format were re-implemented. Now glp_write_lp alpar@1: correctly writes double-bounded (ranged) rows by introducing alpar@1: slack variables rather than by duplicating the rows. The data alpar@1: structure glp_cpxcp and routine glp_init_cpxcp were added. alpar@1: alpar@1: * amd/* alpar@1: The 'xfree(NULL)' bug was fixed in the AMD routines. Thanks to alpar@1: Niels Klitgord for the bug report. alpar@1: alpar@1: * glpapi16.c alpar@1: New API routines glp_set_vertex_name, glp_create_v_index, alpar@1: glp_find_vertex, and glp_delete_v_index were added. alpar@1: alpar@1: * glpdmx.c alpar@1: New API routines glp_read_asnprob, glp_write_asnprob, alpar@1: glp_read_ccformat, and glp_write_ccformat were added (the two alpar@1: latter routines are not documented yet). alpar@1: alpar@1: * glpapi18.c alpar@1: New API routines glp_check_asnprob, glp_asnprob_lp, alpar@1: glp_asnprob_okalg, and glp_asnprob_hall were added. alpar@1: alpar@1: * glpini01.c, glpini02.c alpar@1: The message "Crashing..." was changed to "Constructing initial alpar@1: basis..." due to suggestion by Thomas Kahle . alpar@1: alpar@1: * glpapi14.c alpar@1: New API routines glp_printf, glp_vprintf, glp_malloc, alpar@1: glp_calloc, glp_free, and glp_assert were added. alpar@1: alpar@1: * glplpp.h, glplpp01.c, glplpp02.c alpar@1: Old LP presolver routines were removed. Now glp_simplex uses alpar@1: new preprocessing routines (see glpnpp). alpar@1: alpar@1: * glpapi12.c alpar@1: New API routine glp_warm_up was added; it replaces the routine alpar@1: lpx_warm_up. alpar@1: alpar@1: Sat May 02 12:00:00 2009 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.38 (23:0:23) has been released alpar@1: alpar@1: * glpmps.c alpar@1: API routines to read/write MPS files were re-implemented. alpar@1: alpar@1: * glpspx02.c alpar@1: Some improvements were made in the dual simplex routine. alpar@1: alpar@1: * glpk.h alpar@1: New structure glp_iptcp was added. alpar@1: alpar@1: * glpnpp.h, glpnpp01.c, glpnpp02.c alpar@1: New LP/MIP preprocessor. Currently it includes only some basic alpar@1: routines and used only in the interior-point solver. alpar@1: alpar@1: * glpapi08.c alpar@1: API routine glp_interior was replaced by an improved version alpar@1: (new LP/MIP preprocessor, new ordering algorithms). alpar@1: alpar@1: New API routine glp_init_iptcp was added. alpar@1: alpar@1: API routine glp_ipt_status may return two new statuses due to alpar@1: changes in glp_interior. alpar@1: alpar@1: * glpsol.c alpar@1: New command-line options were added (ordering algorithm used in alpar@1: the interior-point solver). alpar@1: alpar@1: * amd/*.*, colamd/*.* alpar@1: Two external software modules AMD and COLAMD/SYMAMD used in the alpar@1: interior-point solver were included in the distribution. alpar@1: alpar@1: For details see amd/README and colamd/README. alpar@1: alpar@1: * glpnet03.c, glpnet04.c, glpnet05.c alpar@1: A minor bug was fixed (_G => G_). Thanks to Nelson H. F. Beebe alpar@1: for bug report. alpar@1: alpar@1: Sun Mar 29 12:00:00 2009 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.37 (22:0:22) has been released alpar@1: alpar@1: * glpk.h alpar@1: iocp.fp_heur was added to enable/disable fpump heuristic. alpar@1: alpar@1: * glpios10.c alpar@1: ios_feas_pump was added (feasibility pump heuristic). alpar@1: alpar@1: * glpsol.c alpar@1: --fpump command-line option was added. alpar@1: alpar@1: * glpsds.c alpar@1: Plain data set routines were added to facilitate reading plain alpar@1: data in application programs. Currently these routines are not alpar@1: in API, though declared in glpk.h. alpar@1: alpar@1: * glpapi08.c alpar@1: A bug was fixed in the internal routine restore. (Due to this alpar@1: bug dual solution components were computed incorrectly if the alpar@1: problem was scaled.) alpar@1: alpar@1: * glpapi10.c, glpapi11.c alpar@1: The following new API routines were added: alpar@1: glp_print_sol (replaces lpx_print_sol); alpar@1: glp_print_ipt (replaces lpx_print_ips); alpar@1: glp_print_mip (replaces lpx_print_mip); alpar@1: _glp_check_kkt (replaces lpx_check_kkt, lpx_check_int). alpar@1: Now the routine lpx_print_prob (deprecated) is equivalent to alpar@1: the routine glp_write_lp. alpar@1: alpar@1: * glpapi18.c, glpapi19.c alpar@1: The following new API routines were added: alpar@1: glp_read_graph (read graph from plain text file); alpar@1: glp_write_graph (write graph to plain text file); alpar@1: glp_weak_comp (find all weakly connected components); alpar@1: glp_strong_comp (find all strongly connected components). alpar@1: alpar@1: * configure.ac, Makefile.am alpar@1: Changes were made: (a) to allow using autoreconf/autoheader; alpar@1: (b) to allow building glpk in a directory other than its source alpar@1: directory. Thanks to Marco Atzeri for alpar@1: bug report. alpar@1: alpar@1: * examples/shiftcover.mod alpar@1: An example model in MathProg was added. alpar@1: Thanks to Larry D'Agostino alpar@1: for contribution. alpar@1: alpar@1: Fri Feb 06 12:00:00 2009 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.36 (21:0:21) has been released alpar@1: alpar@1: * glpnet06.c, glpnet07.c, glpapi19.c alpar@1: The following new API routines were added: alpar@1: glp_mincost_okalg find minimum-cost flow with out-of-kilter alpar@1: algorithm alpar@1: glp_maxflow_ffalg find maximal flow with Ford-Fulkerson alpar@1: algorithm alpar@1: alpar@1: * glpsol.c alpar@1: Two new command-line options were added: alpar@1: --mincost read min-cost flow data in DIMACS format alpar@1: --maxflow read maximum flow data in DIMACS format alpar@1: alpar@1: * doc/glpk.* alpar@1: New edition of the reference manual was included. alpar@1: alpar@1: * glpk.h alpar@1: Duplicate symbols were removed to allow using swig. alpar@1: Thanks to Kelly Westbrooks and alpar@1: Nigel Galloway for suggestion. alpar@1: alpar@1: * glpcpx.c alpar@1: A minor defect was fixed in the routine glp_write_lp. alpar@1: Thanks to Sebastien Briais for bug report. alpar@1: alpar@1: * glpsql.c alpar@1: A minor bug was fixed. Thanks to Xypron alpar@1: for patch. alpar@1: alpar@1: * examples/hashi.mod, examples/shikaku.mod alpar@1: Two example models in MathProg were added. Thanks to Sebastian alpar@1: Nowozin for contribution. alpar@1: alpar@1: * examples/qfit.mod, examples/yacfs.mod alpar@1: Two example models in MathProg were added. Thanks to Nigel alpar@1: Galloway for contribution. alpar@1: alpar@1: Fri Jan 09 12:00:00 2009 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.35 (20:0:20) has been released alpar@1: alpar@1: * glpk.h, glpapi.c, glpnet.c alpar@1: The following new API routines were added: alpar@1: glp_create_graph create graph alpar@1: glp_set_graph_name assign (change) graph name alpar@1: glp_add_vertices add new vertices to graph alpar@1: glp_add_arc add new arc to graph alpar@1: glp_erase_graph erase graph content alpar@1: glp_delete_graph delete graph alpar@1: glp_read_mincost read minimum cost flow problem data in alpar@1: DIMACS format alpar@1: glp_write_mincost write minimum cost flow problem data in alpar@1: DIMACS format alpar@1: glp_mincost_lp convert minimum cost flow problem to LP alpar@1: glp_netgen Klingman's network problem generator alpar@1: glp_gridgen grid-like network problem generator alpar@1: glp_read_maxflow read maximum flow problem data in DIMACS alpar@1: format alpar@1: glp_write_maxflow write maximum flow problem data in DIMACS alpar@1: format alpar@1: glp_maxflow_lp convert maximum flow problem to LP alpar@1: glp_rmfgen Goldfarb's maximum flow problem generator alpar@1: alpar@1: * doc/glpk.* alpar@1: New edition of the reference manual was included. alpar@1: alpar@1: * examples/sample.min, examples/sample.max alpar@1: Two example data files in DIMACS format were added. alpar@1: alpar@1: * glplib04.c alpar@1: The statement "if (c = '\n') fflush(stdout)" was added to the alpar@1: internal routine xputc to provide "real-time" terminal output. alpar@1: Thanks to Luiz Bettoni for alpar@1: suggestion. alpar@1: alpar@1: * glpmpl05.c alpar@1: A minor bug was fixed in the internal routine mpl_fn_time2str. alpar@1: Thanks to Stefan Vigerske for bug report. alpar@1: alpar@1: * w32/makefile, w64/makefile alpar@1: The flag -O2 (/O2) was added to some makefiles. alpar@1: alpar@1: Thu Dec 04 12:00:00 2008 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.34 (19:0:19) has been released alpar@1: alpar@1: * src/glpios03.c alpar@1: A bug was fixed in the internal routine branch_on. Thanks to alpar@1: Nigel Galloway for bug report. alpar@1: alpar@1: * src/glpmpl05.c alpar@1: Three new MathProg functions were included: alpar@1: gmtime obtaining current calendar time alpar@1: str2time converting character string to calendar time alpar@1: time2str converting calendar time to character string alpar@1: Thanks to Xypron . alpar@1: alpar@1: * doc/glpk.*, doc/gmpl.* alpar@1: A new edition of the GLPK reference manual and GNU MathProg alpar@1: language description were included. alpar@1: alpar@1: Thu Oct 30 12:00:00 2008 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.33 (18:0:18) has been released alpar@1: alpar@1: * glpapi*.* alpar@1: The following new API routines were added: alpar@1: glp_copy_prob copy problem object content alpar@1: glp_exact solve LP in exact arithmetic alpar@1: (makes lpx_exact deprecated) alpar@1: glp_get_unbnd_ray determine variable causing unboundedness alpar@1: (makes lpx_get_ray_info deprecated) alpar@1: glp_interior solve LP with interior-point method alpar@1: (makes lpx_interior deprecated) alpar@1: alpar@1: * glpapi*.* alpar@1: The following new API routines for processing models written in alpar@1: the GNU Mathprog language were added to the package: alpar@1: glp_mpl_alloc_wksp allocate the translator workspace alpar@1: glp_mpl_read_model read and translate model section alpar@1: glp_mpl_read_data read and translate data section alpar@1: glp_mpl_generate generate the model alpar@1: glp_mpl_build_prob build LP/MIP instance from the model alpar@1: glp_mpl_postsolve postsolve the model alpar@1: glp_mpl_free_wksp deallocate the translator workspace alpar@1: (These routines make lpx_read_model deprecated.) alpar@1: alpar@1: * src/glpapi17.c, examples/glpsol.c alpar@1: The stand-alone solver glpsol was re-implemented with new API alpar@1: routines. alpar@1: alpar@1: * src/glpsql.c alpar@1: Some bugs were fixed in the SQL table driver. Thanks to Xypron alpar@1: . alpar@1: alpar@1: * examples/cplex/*.* alpar@1: A crude implementation of CPLEX-like interface to GLPK API was alpar@1: added to the package. See examples/cplex/README. alpar@1: alpar@1: Fri Oct 03 12:00:00 2008 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.32 (17:0:17) has been released alpar@1: alpar@1: * glpmpl01.c alpar@1: A bug was fixed. Due to this bug iterated expressions having alpar@1: an indexing expression whose dummy indices are bound to some alpar@1: values, i.e. like sum{(i+1,j,k-1) in E} x[i,j,k] are evaluated alpar@1: incorrectly. Namely, current value of such expressions is not alpar@1: invalidated when corresponding dummy indices (like i and k in alpar@1: the example above) are changed, that erroneously results in the alpar@1: same value evaluated for the first time. alpar@1: alpar@1: * glpios03.c alpar@1: Euclidean reduction of the local objective bound was added in alpar@1: the routine glpios03.c. alpar@1: alpar@1: * glpapi11.c alpar@1: The following new branch-and-cut API routines were added: alpar@1: glp_ios_row_attr determine additional row attributes; alpar@1: glp_ios_pool_size determine current size of the cut pool; alpar@1: glp_ios_add_row add constraint to the cut pool; alpar@1: glp_ios_del_row delete constraint from the cut pool; alpar@1: glp_ios_clear_pool delete all constraints from the cut pool. alpar@1: alpar@1: * glpapi08.c alpar@1: The following new features were included in the branch-and-cut alpar@1: solver (the API routine glp_intopt): alpar@1: MIP presolver; alpar@1: mixed cover cut generator; alpar@1: clique cut generator. alpar@1: Due to the MIP presolver glp_intopt may additionally return alpar@1: GLP_ENOPFS and GLP_ENODFS, if primal or dual infeasibility of alpar@1: LP relaxation is detected by the presolver. Also the return alpar@1: code GLP_EMIPGAP was introduced to correctly indicate that the alpar@1: mip gap tolerance is reached. alpar@1: alpar@1: * glplpx01.c alpar@1: Now the obsolete API routines lpx_integer and lpx_intopt are alpar@1: completely superseded by the API routine glp_intopt that makes alpar@1: them deprecated. alpar@1: alpar@1: * glpmpl05.c alpar@1: Now the table driver name "iODBC" can be specified as "ODBC". alpar@1: alpar@1: * glpmpl03.c alpar@1: A bug fixed in the routine free_dca. alpar@1: Thanks to Xypron . alpar@1: alpar@1: * glpsql.c alpar@1: A bug was fixed in the SQL table driver. alpar@1: Thanks to Xypron . alpar@1: alpar@1: * examples/glpsol.c alpar@1: Changes were made to allow multiple MathProg data files. alpar@1: alpar@1: * doc/glpk.* alpar@1: A new edition of the GLPK reference manual was included. alpar@1: alpar@1: * doc/tables.* alpar@1: A new edition of the supplement "Using data tables in the GNU alpar@1: MathProg language" was included. alpar@1: alpar@1: Tue Sep 02 12:00:00 2008 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.31 (16:0:16) has been released alpar@1: alpar@1: * glpspx.h, glpspx01.c, glpspx02.c, glpapi06.c alpar@1: The dual simplex solver (spx_dual_opt) was replaced by a new alpar@1: implementation of the two-phase dual simplex method (spx_dual). alpar@1: Old simplex method routines (spx_prim_opt, spx_prim_feas, and alpar@1: spx_dual_opt) were removed from the package. alpar@1: alpar@1: * glpk.h, glpscl.h, glpscl.c, glpapi04.c alpar@1: New API routine glp_scale_prob was added. It replaces routine alpar@1: lpx_scale_prob which is deprecated. alpar@1: alpar@1: * glpk.h, glpini.h, glpini01.c, glpini02.c, glpapi05.c alpar@1: New API routines glp_std_basis, glp_adv_basis, glp_cpx_basis alpar@1: were added. They replace routines lpx_std_basis, lpx_adv_basis, alpar@1: lpx_cpx_basis which are deprecated. alpar@1: alpar@1: * glpdmp.c alpar@1: 8-byte data alignment was added to the module (sufficient for alpar@1: both ILP32 and LP64 environments). alpar@1: alpar@1: * glplib07.c alpar@1: 16-byte data alignment was added to the module to provide alpar@1: compatibility with LP64 environment (8-byte is not sufficient alpar@1: due to jmp_buf; thanks to Xypron for investigation). alpar@1: alpar@1: * glplpx16.c alpar@1: New version of the routine lpx_write_pb was added. Thanks to alpar@1: Oscar Gustafsson for the contribution. alpar@1: alpar@1: * w32/VC9, w64/VC9 alpar@1: Makefiles and batch files were added to build GLPK under 32- alpar@1: and 64-bit Windows with Microsoft Visual Studio Express 2008. alpar@1: Thanks to Heinrich Schuchardt for alpar@1: the contribution and testing. alpar@1: alpar@1: * w32/DM, w32/OWC alpar@1: Makefiles and batch files were added to build GLPK with Digital alpar@1: Mars C/C++ 8.50 and Open Watcom C/C++ 1.6 (32-bit Windows). alpar@1: alpar@1: Wed Aug 13 12:00:00 2008 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.30 (15:0:15) has been released alpar@1: alpar@1: * glpspx.h, glpspx03.c, glpapi06.c alpar@1: The primal simplex solver (spx_prim_opt, spx_prim_feas) was alpar@1: replaced by a new implementation (spx_primal), which currently alpar@1: provides the same features as the old version. alpar@1: alpar@1: * glpmpl01.c, glpmpl03.c alpar@1: Some changes were made in the MathProg translator to allow <, alpar@1: <=, >=, and > on comparing symbolic values. Thanks to Heinrich alpar@1: Schuchardt for patches. alpar@1: alpar@1: * glplpx10.c alpar@1: Internal routine set_d_eps in the exact LP solver was changed alpar@1: to prevent approximation errors in case of integral data. alpar@1: Thanks to Markus Pilz for bug report. alpar@1: alpar@1: XXX XXX XX 12:00:00 2008 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.29 (14:0:14) has been released alpar@1: alpar@1: * configure.ac alpar@1: The configure script was changed to disable optional features alpar@1: by default. For details see file INSTALL. alpar@1: alpar@1: * glpipp02.c alpar@1: A bug was fixed in the internal routine reduce_bounds. Thanks alpar@1: to Anne-Laurence Putz for alpar@1: the bug report. alpar@1: alpar@1: * glpapi01.c alpar@1: New API routine glp_erase_prob was added. alpar@1: alpar@1: * glpapi13.c alpar@1: New API routines glp_read_mps and glp_write_mps were added. alpar@1: They replace API routines lpx_read_mps, lpx_read_freemps, alpar@1: lpx_write_mps, and lpx_write_freemps, which are deprecated. alpar@1: alpar@1: * glpapi14.c alpar@1: New API routines glp_read_lp and glp_write_lp were added. They alpar@1: replace API routines lpx_read_cpxlp and lpx_write_cpxlp, which alpar@1: are deprecated. alpar@1: alpar@1: * glpsql.c alpar@1: Minor bug was fixed. Thanks to Xypron for alpar@1: the bug report. alpar@1: alpar@1: Tue Mar 25 12:00:00 2008 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.28 (13:0:13) has been released alpar@1: alpar@1: * glplib.h, glplib.c alpar@1: Three wrapper routines xdlopen, xdlsym, and xdlclose, which alpar@1: provide the shared library support, were added. A particular alpar@1: version of these routines depends on the option --enable-dl alpar@1: passed to the configure script (see file INSTALL for details). alpar@1: Thanks to Rafael Laboissiere for useful alpar@1: advices concerning the shared library support. alpar@1: alpar@1: * glpsql.c alpar@1: A static linking to iODBC and MySQL libraries used in the alpar@1: MathProg table drivers was replaced by a dynamic linking to alpar@1: corresponding shared libraries. alpar@1: Many thanks to Heinrich Schuchardt alpar@1: for the contribution and to Vijay Patil alpar@1: for testing this feature under Windows XP. alpar@1: alpar@1: * glpgmp.h, glpgmp.c alpar@1: A bug (which appeared only on 64-bit platforms) was fixed. alpar@1: Thanks to Axel Simon for the bug report. alpar@1: alpar@1: * glpapi.c alpar@1: A bug was fixed in the api routine glp_add_cols. (If the basis alpar@1: is valid, adding column keeps it valid, however, col->bind was alpar@1: set to -1 rather to 0.) alpar@1: Thanks to Cedric[FR] for the bug report. alpar@1: alpar@1: * glplib.c alpar@1: 64-bit unsigned int type glp_ulong and corresponding routines alpar@1: were replaced by 64-bit signed int type xlong_t. alpar@1: alpar@1: * glpk.h, glpapi.c alpar@1: The type glp_ulong was replaced by glp_long. This affects only alpar@1: the api routine glp_mem_usage. alpar@1: alpar@1: * glplib.c alpar@1: Compressed data file support was added. This feature requires alpar@1: the zlib data compression libraries and allows compressing and alpar@1: decompressing .gz files "on the fly". alpar@1: alpar@1: * glpcli.h, glpcli.c alpar@1: Command-line interface routines were added. (This feature is alpar@1: incomplete so far.) alpar@1: alpar@1: Sun Mar 02 12:00:00 2008 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.27 (12:0:12) has been released alpar@1: alpar@1: * glpsql.h, glpsql.c alpar@1: Two MathProg table drivers for iODBC and MySQL contributed by alpar@1: Heinrich Schuchardt were added to alpar@1: the package. alpar@1: alpar@1: * glpmpl05.c alpar@1: Mathprog table driver for xBASE was added to the package. alpar@1: alpar@1: * glpmpl03.c alpar@1: A minor was fixed in the MathProg translator (if some field alpar@1: specified in the table statement is missing in corresponding alpar@1: input table, the bug causes abnormal termination). Thanks to alpar@1: Heinrich Schuchardt for the bug alpar@1: report. alpar@1: alpar@1: * glpmpl.h, glpmpl.c alpar@1: STRING data type was replaced by plain character strings. alpar@1: alpar@1: Sun Feb 17 12:00:00 2008 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.26 (11:0:11) has been released alpar@1: alpar@1: * glpmpl.h, glpmpl01.c, glpmpl03.c, glpmpl05.c alpar@1: The table statement was implemented. Description of this new alpar@1: feature is given in file doc/tables.txt. alpar@1: alpar@1: * glpios03.c alpar@1: A bug causing zero divide error on computing euclidean norm of alpar@1: the cut coefficient vector was fixed. alpar@1: alpar@1: Wed Dec 19 12:00:00 2007 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.25 (10:0:10) has been released alpar@1: alpar@1: * glpapi10.c alpar@1: Routines lpx_eval_tab_row and lpx_eval_tab_col were replaced by alpar@1: glp_eval_tab_row and glp_eval_tab_col. alpar@1: alpar@1: * glpios03.c, glpios05.c alpar@1: Gomory's mixed integer cuts were implemented. alpar@1: alpar@1: * glpscs.h, glpscs.c alpar@1: Segmented character string routines are no longer used and were alpar@1: removed from the package. alpar@1: alpar@1: Wed Nov 21 12:00:00 2007 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.24 (9:0:9) has been released alpar@1: alpar@1: * src/glplpx16.c alpar@1: A bug was fixed in the routine lpx_write_cpxlp. If a variable alpar@1: x has upper bound and no lower bound, it should appear in the alpar@1: bounds section as "-inf <= x <= u", not as "x <= u". Thanks to alpar@1: Enric Rodriguez for the bug report. alpar@1: alpar@1: * src/glpios03.c, src/glpios04.c, src/glpios05.c alpar@1: MIR (mixed integer rounding) cuts were implemented. alpar@1: alpar@1: Sun Oct 28 12:00:00 2007 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.23 (8:0:8) has been released alpar@1: alpar@1: * src/glplib05.c, configure.ac alpar@1: Check for vsnprintf was added. alpar@1: alpar@1: * include/glppds.h, src/glppds.c alpar@1: A module to scan plain data was added. alpar@1: alpar@1: * src/glpapi09.c alpar@1: The following new API routines were added: alpar@1: glp_read_sol read basic solution from text file; alpar@1: glp_write_sol write basic solution to text file; alpar@1: glp_read_ipt read interior-point solution from text file; alpar@1: glp_write_ipt write interior-point solution to text file; alpar@1: glp_read_mip read MIP solution from text file; alpar@1: glp_write_mip write MIP solution to text file. alpar@1: alpar@1: * src/glpapi12.c alpar@1: Advanced API routine glp_free_env was added. alpar@1: alpar@1: * examples/glpsol.c alpar@1: The following three command-line options were added: alpar@1: --mipgap tol set relative MIP gap tolerance alpar@1: -r filename read solution from filename alpar@1: -w filename write solution to filename alpar@1: alpar@1: Wed Sep 19 12:00:00 2007 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.22 (7:0:7) has been released alpar@1: alpar@1: * src/glpios02.c alpar@1: A bug was fixed in the MIP preprocessor (ios_preprocess_node). alpar@1: Thanks to Roberto Bagnara (Department of alpar@1: Mathematics, University of Parma, Italy) for the bug report. alpar@1: alpar@1: * src/glpios02.c alpar@1: A bug was fixed in the MIP preprocessor (col_implied_bounds), alpar@1: due to which constraint coefficients with small magnitude could alpar@1: lead to wrong implied bounds of structural variables. alpar@1: alpar@1: * src/glpipp02.c alpar@1: A similar bug was fixed in the routine reduce_bounds. alpar@1: alpar@1: * src/glpapi01.c alpar@1: A bug was fixed in the routines glp_set_mat_row and alpar@1: glp_set_mat_col. (The bug appeared due to incorrect removing alpar@1: zero elements from the row/column lists.) alpar@1: alpar@1: * src/glplpx14.c alpar@1: A bug was fixed in the API routines lpx_read_mps and alpar@1: lpx_read_freemps, due to which bounds of type LI specified in alpar@1: BOUNDS section were incorrectly processed. alpar@1: alpar@1: * src/glplib05.c alpar@1: A call to standard function vsprintf was replaced by a call to alpar@1: vsnprintf for security reasons. Many thanks to Peter T. Breuer alpar@1: and Rafael Laboissiere . alpar@1: alpar@1: Tue Aug 28 12:00:00 2007 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.21 (6:0:6) has been released alpar@1: alpar@1: * glpscg.h, glpscg.c alpar@1: Routines to maintain sparse cliqued graph were added. alpar@1: alpar@1: * glpios02.c alpar@1: MIP preprocessing routines were added. alpar@1: alpar@1: * glpk.h, glpios.h, glpios03.c alpar@1: New reasons for calling the callback routine were introduced alpar@1: in the MIP solver. alpar@1: alpar@1: * glpapi08.c alpar@1: Default backtracking strategy was changed to best local bound. alpar@1: alpar@1: * glpapi11.c alpar@1: New API routine glp_term_out to enable/disable terminal output alpar@1: was added. alpar@1: alpar@1: * glprng.h, glprng02.c alpar@1: Two routines to generate uniformly distributed pseudo-random alpar@1: floating-point numbers were added. alpar@1: alpar@1: Thu Jul 26 12:00:00 2007 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.20 (5:0:5) has been released alpar@1: alpar@1: * glpk.h, glpapi08.c alpar@1: The routine lpx_integer was replaced by an equivalent routine alpar@1: glp_intopt. Also new API routine glp_init_iocp was added. alpar@1: alpar@1: * glpiet.h, glpiet.c alpar@1: Routines implementing the implicit enumeration tree are alpar@1: no longer used and therefore were removed from the package. alpar@1: alpar@1: * glpios.h, glpios01.c, glpios02, glpios03 alpar@1: Routines implementing the integer optimization suite being alpar@1: replaced by a new version were removed from the package. alpar@1: alpar@1: * glpmip.h, glpmip01.c, glpmip02.c alpar@1: alpar@1: Routines implementing the B&B method being replaced by a new alpar@1: version were removed from the package. alpar@1: alpar@1: * glpios.h, glpios01.c, glpios02.c alpar@1: alpar@1: Routines implementing a new version of the integer optimization alpar@1: suite (IOS) based on the B&B method were added to the package. alpar@1: alpar@1: * glpk.h, glpapi10.c alpar@1: Branch-and-bound interface routines were added to the package. alpar@1: alpar@1: * examples/tspsol.c alpar@1: The TSP solver based on old version of the integer optimization alpar@1: suite is no more supported and was removed from the package. alpar@1: alpar@1: * glpipp02.c alpar@1: An error in the routine reduce_bounds was fixed; thanks to alpar@1: Graham Rockwell for the bug report. alpar@1: alpar@1: * glpk.latex alpar@1: A new edition of the reference manual was included. alpar@1: alpar@1: Thu Jul 05 12:00:00 2007 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.19 (4:0:4) has been released alpar@1: alpar@1: The principal change is upgrading to GPLv3. alpar@1: alpar@1: * glpapi01.c alpar@1: A serious bug in the routine glp_del_cols was fixed; thanks to alpar@1: Cedric[FR] for the bug report. The bug alpar@1: appeared because on deleting non-basic columns the basis header alpar@1: remained valid, however, contained invalid (old) column ordinal alpar@1: numbers. alpar@1: alpar@1: * glpapi10.c alpar@1: A new advanced API routine glp_mem_limit was added. alpar@1: alpar@1: * glplpx01.c alpar@1: The case GLP_EBOUND was added to the routine lpx_simplex. alpar@1: Thanks to Cameron Kellough for the alpar@1: bug report. alpar@1: alpar@1: * glplpx19.c alpar@1: An API routine lpx_write_pb to write the problem instance in alpar@1: OPB (pseudo boolean) format format was added. Thanks to Oscar alpar@1: Gustafsson for the contribution. alpar@1: alpar@1: * glpsol.c alpar@1: Two new options --wpb and --wnpb were added to glpsol to write alpar@1: the problem instance in OPB format. alpar@1: alpar@1: Mon Jun 25 12:00:00 2007 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.18 (3:0:3) has been released alpar@1: alpar@1: * glplib.h alpar@1: Type names ulong_t and uldiv_t were changed to glp_ulong and alpar@1: glp_uldiv to avoid conflicts with standard type names on some alpar@1: platforms. Thanks to Boris Wirtz alpar@1: for the bug report. alpar@1: alpar@1: * glpbfd.*, glpfhv.*, glplpf.* alpar@1: LP basis factorization routines were made tidy. alpar@1: alpar@1: * glpk.h, glpapi04.c alpar@1: The following API routines were added: alpar@1: glp_set_rii, glp_set_sjj, glp_get_rii, glp_get_sjj. alpar@1: alpar@1: * glpk.h, glpapi06.c alpar@1: The routine lpx_simplex was replaced by an equivalent routine alpar@1: glp_simplex. Also new API routine glp_init_smcp was added. alpar@1: alpar@1: * glpk.h, glpapi09.c alpar@1: The following advanced API routines were added: alpar@1: glp_bf_exists, glp_factorize, glp_bf_updated, glp_get_bfcp, alpar@1: glp_set_bfcp, glp_get_bhead, glp_get_row_bind, glp_get_col_bind, alpar@1: glp_ftran, glp_btran. alpar@1: alpar@1: * glpk.latex alpar@1: A new edition of the reference manual was included. alpar@1: alpar@1: * examples/dea.mod, examples/food.mod, examples/food2.mod alpar@1: Three examples in the MathProg language were added. alpar@1: Thanks to Sebastian Nowozin . alpar@1: alpar@1: Sat May 26 12:00:00 2007 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.17 (2:0:2) has been released alpar@1: alpar@1: * glpdmp.h, glpdmp.c alpar@1: Memory pool routines were replaced by a new version. alpar@1: alpar@1: * glpscs.h, glpscs.c alpar@1: Segmented string routines were replaced by a new version. alpar@1: alpar@1: * glplpx08.c, glplpx09.c alpar@1: Now the MIP problem may have no integer columns. alpar@1: alpar@1: * glpapi01.c alpar@1: The routines glp_set_mat_row, glp_set_mat_col, and glp_load_mat alpar@1: were modified to allow zero elements (which are not stored in alpar@1: the constraint matrix). alpar@1: alpar@1: * glpscf.h, glpscf.c alpar@1: Schur complement factorization routines were implemented. alpar@1: alpar@1: * glplpf.h, glplpf.c alpar@1: LP basis factorization routines based on LU-factorization and alpar@1: Schur complement were implemented. alpar@1: alpar@1: * glplpx02.c, glplpx03.c alpar@1: New control parameter LPX_K_BFTYPE was introduced to choose the alpar@1: basis factorization type used by the simplex method routines. alpar@1: alpar@1: * glpsol.c alpar@1: Three new command-line options were added to choose the basis alpar@1: factorization type used by the simplex method routines: --luf, alpar@1: --cbg, and --cgr. alpar@1: alpar@1: * glpk.latex alpar@1: A new edition of the reference manual was included. alpar@1: alpar@1: Sat May 05 12:00:00 2007 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.16 (1:0:1) has been released alpar@1: alpar@1: * glpk.h, glpapi.c, glplpx01.c, glplpx02.c alpar@1: Names of a number basic api routines were changed and now have alpar@1: the prefix 'glp_'. To keep backward compatibility these routines alpar@1: are also available via their old names prefixed with 'lpx_'. alpar@1: alpar@1: * glplpx19.c alpar@1: Three new api routines were added: glp_version, glp_term_hook, alpar@1: and glp_mem_usage. alpar@1: alpar@1: * glpk.latex, gmpl.texi alpar@1: A new edition of the reference manuals was included. alpar@1: alpar@1: * lpglpk40.c alpar@1: This example program is no longer supported and therefore was alpar@1: removed from the package. alpar@1: alpar@1: Sun Feb 18 12:00:00 2007 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.15 (0:0:0) has been released alpar@1: alpar@1: * configure.ac, Makefile.am alpar@1: Autotools specification files were changed to use GNU Libtool alpar@1: that allows building the static as well as shared GLPK library. alpar@1: Thanks to Rafael Laboissiere . alpar@1: alpar@1: Mon Feb 05 08:00:00 2007 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.14 has been released alpar@1: Now GLPK conforms to ILP32, LLP64, and LP64 programming models alpar@1: (the latter seems to be the ultimate choice regarding 64-bit alpar@1: architectures). Note that GLPK itself is a 32-bit application, alpar@1: and the conformity only means that the package works correctly alpar@1: on all these arenae. Nevertheless, on 64-bit platforms it is alpar@1: possible to use more than 4GB of memory, if necessary. alpar@1: alpar@1: * Makefile alpar@1: Starting from this release only the header glpk.h is needed to alpar@1: be installed. alpar@1: alpar@1: * glplib01.c alpar@1: Two routines bigmul and bigdiv which performs multiplication alpar@1: and division of unsigned integers of arbitrary precision were alpar@1: added. alpar@1: alpar@1: * glplib02.c alpar@1: A set of 64-bit arithmetic routines were added. alpar@1: alpar@1: * glplib04.c alpar@1: Some low-level library routines were improved and renamed. alpar@1: alpar@1: * glpcfg.h alpar@1: The macro GLP_TM_SPEC were introduced to specify a version of alpar@1: the time routine depending on the host environment. alpar@1: alpar@1: Mon Nov 13 12:00:00 2006 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.13 has been released alpar@1: alpar@1: * configure.in alpar@1: '-lm' bug was fixed. alpar@1: alpar@1: * glpbfx.h, glpbfx.c alpar@1: Basis factorization interface routines based on exact (bignum) alpar@1: arithmetic were implemented. alpar@1: alpar@1: * glpssx.h, glpssx1.c, glpssx2.c alpar@1: Simplex method routines based on exact (bignum) arithmetic were alpar@1: implemented. alpar@1: alpar@1: * glplpx6e.c alpar@1: The routine lpx_exact, which is an easy-to-use driver to the alpar@1: exact simplex method, was added. alpar@1: alpar@1: * glpsol.c alpar@1: Two command-line options were added: '--exact' and '--xcheck'. alpar@1: alpar@1: Wed Nov 08 12:00:00 2006 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.12 has been released alpar@1: alpar@1: * glpcfg.h alpar@1: The package configuration file was added. alpar@1: alpar@1: * glplib2.c alpar@1: Alternative version of the routines umalloc, ucalloc, and ufree alpar@1: was provided. It does not limit the amount of allocated memory alpar@1: to INT_MAX bytes and therefore can be used on platforms where alpar@1: sizeof(void *) > sizeof(int). To enable this version one should alpar@1: define the preprocessor variable GLP_HUGE_MEM. alpar@1: alpar@1: * glprng.c alpar@1: The routine rng_create_rand was changed to initialize the alpar@1: generator using seed = 1, not 0, to conform ISO C requirements. alpar@1: alpar@1: * glpgmp.h, glpgmp.c alpar@1: A set of bignum arithmetic routines implementing operations on alpar@1: integers and rationals was added. These routines are compatible alpar@1: with the GNU MP library. alpar@1: alpar@1: NOTE: To attain a much better performance it is recommended to alpar@1: use, if possible, the original GNU MP library rather than the alpar@1: GLPK version, by defining the preprocessor variable GLP_USE_GMP. alpar@1: alpar@1: * glplux.h, glplux.c alpar@1: A tentative implementation of sparse LU-factorization based on alpar@1: exact (bignum) arithmetic was added. alpar@1: alpar@1: * glpssx.h, glpssx.c alpar@1: A tentative implementation of some simplex method routines based alpar@1: on exact (bignum) arithmetic was added. alpar@1: alpar@1: * glplpx6f.c alpar@1: A preliminary implementation of the routine lpx_exact_check was alpar@1: added. This routine checks the current basis for primal and dual alpar@1: feasibility using exact (bignum) arithmetic. alpar@1: alpar@1: * examples/glpsol.c alpar@1: The command-line option '--xcheck' was introduced to check the alpar@1: current basis for feasibility using exact (bignum) arithmetic. alpar@1: alpar@1: Tue Jul 25 12:00:00 2006 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.11 has been released. alpar@1: alpar@1: * include/glpbfi.h, src/glpbfi.c alpar@1: Basis factorization interface routines were added. alpar@1: alpar@1: * include/glpluf.h, src/glpluf1.c alpar@1: Hypersparse solution routines were added. alpar@1: alpar@1: * include/glpinv.h, src/glpinv1.c alpar@1: Hypersparse solution routines (fake version) were added. alpar@1: alpar@1: * include/glpmpl.h, src/glpmpl.c alpar@1: Built-in functions card, length, and substr were implemented. alpar@1: Output redirection in the printf statement was implemented. alpar@1: alpar@1: * examples/graph.mod, examples/crypto.mod alpar@1: Two example models illustrating new features of the modeling alpar@1: language were included. alpar@1: alpar@1: Thu May 11 12:00:00 2006 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.10 has been released. alpar@1: alpar@1: * src/glplpx8a.c alpar@1: A fragment was added to the routines lpx_read_mps and alpar@1: lpx_read_freemps to accept LI bound type (it is similar to LO, alpar@1: however, additionally marks the column as integer). alpar@1: alpar@1: * include/glpbfi.h, src/glpbfi.c alpar@1: The module glpbfi which implements the basis factorization alpar@1: interface (BFI) was added. alpar@1: alpar@1: * src/glplpx7a.c alpar@1: The routine lpx_cover_cut to generate mixed cover cuts was alpar@1: added. alpar@1: alpar@1: * src/glplpx7b.c alpar@1: The routine lpx_clique_cut to generate clique cuts and related alpar@1: routines to maintain the conflict graph were added. alpar@1: alpar@1: * include/glplpx.h, src/glplpx5.c alpar@1: The routine lpx_cpx_basis implementing Bixby's algorithm to alpar@1: construct an initial LP basis was added. alpar@1: alpar@1: * examples/glpsol.c alpar@1: Command-line option '--bib' was added which allows building alpar@1: an initial LP basis using Bixby's algorithm. alpar@1: Default command-line option '--mps' was changed to '--freemps'. alpar@1: alpar@1: * examples/cf12a.mod, examples/cf12b.mod alpar@1: Two examples in MathProg (curve fitting problem) were added. alpar@1: Thanks to Dr. Harley Mackenzie . alpar@1: alpar@1: Tue Jan 17 12:00:00 2006 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.9 has been released. alpar@1: alpar@1: * glpipp.h, glpipp1.c, glpipp2.c alpar@1: A MIP presolver were implemented (currently incomplete). It is alpar@1: used internally in the routine lpx_intopt (see below). alpar@1: alpar@1: * glplpx6d.c, glplpx7a.c alpar@1: An advanced branch-and-bound solver (the routine lpx_intopt) alpar@1: were implemented. alpar@1: alpar@1: * glplpx6c.c alpar@1: The routine lpx_check_int to check MIP feasibility conditions alpar@1: was added. alpar@1: alpar@1: * glplpx8a.c alpar@1: The routine lpx_print_mip was changed to print MIP feasibility alpar@1: conditions. alpar@1: alpar@1: * glpmpl.h, glpmpl1.c, glpmpl3.c alpar@1: The built-in functions sin, cos, atan, and atan2 were added to alpar@1: the MathProg language. alpar@1: alpar@1: * doc/lang.* alpar@1: Some typos were fixed. alpar@1: Thanks to Minh Ha Duong (CIRED, CNRS). alpar@1: alpar@1: Wed Jan 12 12:00:00 2005 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.8 has been released. alpar@1: alpar@1: * glpspx.h, glpspx1.c, glpspx2.c, glplpx6a.c alpar@1: Simplex method routines were changed due to a new format of the alpar@1: constraint matrix. alpar@1: alpar@1: * glpmat.h, glpmat.c alpar@1: Sparse matrix routines were re-implemented using storage-by-rows alpar@1: format. alpar@1: alpar@1: * glpipm.h, glpipm.c, glplpx6b.c alpar@1: Interior-point method routines were changed due to a new format alpar@1: of sparse matrices. alpar@1: alpar@1: * glpchol.h, glpchol.c alpar@1: Old version of Cholesky factorization routines being replaced by alpar@1: a new one (see glpmat.c) was removed from the package. alpar@1: alpar@1: * glplpx8c.c alpar@1: Minor bug was fixed in api routine lpx_read_cpxlp. alpar@1: alpar@1: Mon Aug 23 12:00:00 2004 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.7 has been released. alpar@1: alpar@1: * glplpx.h, glplpx1.c alpar@1: New core API routines were added (but not documented yet): alpar@1: lpx_order_matrix, lpx_create_index, lpx_find_row, lpx_find_col, alpar@1: lpx_delete_index. alpar@1: alpar@1: * glplpx8a.c alpar@1: API routine lpx_read_mps was re-implemented, and two new API alpar@1: routines lpx_read_freemps and lpx_write_freemps were added to alpar@1: support free MPS format. alpar@1: alpar@1: * glplpx8c.c alpar@1: Two API routines lpx_read_cpxlp and lpx_write_cpxlp (formerly alpar@1: named lpx_read_lpt and lpx_write_lpt) were re-implemented. alpar@1: alpar@1: * glpmps.h, glpmps.c alpar@1: This module formerly used in lpx_read_mps was removed from the alpar@1: package. alpar@1: alpar@1: * glplpt.h, glplpt.c alpar@1: This module formerly used in lpx_read_lpt was removed from the alpar@1: package. alpar@1: alpar@1: * glpmip.h, glpmip1.h, glpmip2.h alpar@1: New MIP routines mip_best_node and mip_relative_gap were added alpar@1: due to suggestion of Brady Hunsaker . alpar@1: alpar@1: * glpsol.c alpar@1: The following new command-options were added: alpar@1: --freemps to read problem data in free MPS format alpar@1: --wfreemps to write problem data in free MPS format alpar@1: --cpxlp to read problem data in CPLEX LP format alpar@1: --wcpxlp to write problem data in CPLEX LP format alpar@1: --bas to read LP basis from a text file in MPS format alpar@1: --wbas to write LP basis to a text file in MPS format alpar@1: --mostf to use "most fractional" branching heuristic alpar@1: --bestb to use "best bound" backtracking heuristic alpar@1: alpar@1: * contrib/deli/*.* alpar@1: GLPK Delphi interface module was temporarily removed from the alpar@1: distribution due to licensing problems. alpar@1: alpar@1: * contrib/glpkmex/*.* alpar@1: GLPK Matlab interface module was temporarily removed from the alpar@1: distribution due to licensing problems. alpar@1: alpar@1: * contrib/jni/*.* alpar@1: GLPK Java interface module was temporarily removed from the alpar@1: distribution due to licensing problems. alpar@1: alpar@1: Wed Aug 04 12:00:00 2004 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.6 has been released. alpar@1: alpar@1: * glpmpl.h, glpmpl1.c, glpmpl2.c, glpmpl3.c, glpmpl4.c alpar@1: Three new statements were implemented in the GNU MathProg alpar@1: language: solve, printf, and for. Also some bugs were fixed. alpar@1: alpar@1: * glplpx.h, glplpx8e.c alpar@1: Two API routines were added: lpx_read_prob and lpx_write_prob, alpar@1: which allow reading and writing problem data in GNU LP format. alpar@1: alpar@1: * glpsol.c alpar@1: Three new command-line options were added: --glp (to read alpar@1: problem data in GNU LP format), --wglp (to write problem data alpar@1: in GNU LP format), and --name (to change problem name). alpar@1: alpar@1: * glprng.h, glprng.c alpar@1: A portable pseudo-random number generator was implemented as a alpar@1: separate module. alpar@1: alpar@1: * glplib4.c alpar@1: The old implementation of a pseudo-random number generator was alpar@1: removed from the package. alpar@1: alpar@1: * doc/lang.*, doc/refman.* alpar@1: New edition of the GLPK documentation was included. alpar@1: alpar@1: * contrib/glpkmex/*.* alpar@1: A new version of GLPKMEX was included in the distribution. For alpar@1: more details see contrib/glpkmex/ChangeLog. alpar@1: alpar@1: Mon Jul 19 12:00:00 2004 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.5 has been released. alpar@1: alpar@1: * glpmip.h, glpmip1.c, glpmip2.c, glplpx6c.c alpar@1: New implementation of the branch-and-bound method was added. alpar@1: It replaces the old implementation, which was removed from the alpar@1: package. alpar@1: alpar@1: * glpies.h, glpies1.c, glpies2.c, glpies3.c alpar@1: Modules used in the old implementation of the branch-and-bound alpar@1: method were removed from the package. alpar@1: alpar@1: * glplib2.c alpar@1: Now if the preprocessor variable GLPHUGEMEM is defined, other alpar@1: version of the routines umalloc, ucalloc, and ufree is used on alpar@1: compiling the package. This allows avoiding memory allocation alpar@1: problems on platforms where sizeof(void *) > sizeof(int), for alpar@1: example, where addresses are 64-bit while integers are 32-bit. alpar@1: The modification was made due to a bug report provided by Karel alpar@1: Zimmermann and Christophe Caron alpar@1: . alpar@1: alpar@1: Sat Jan 17 12:00:00 2004 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.4 has been released. alpar@1: alpar@1: * glplpx.h, glplpx*.c alpar@1: All API routines were re-implemented using new data structures. alpar@1: Some new API routines were added and some existing API routines alpar@1: became obsolete as shown below: alpar@1: alpar@1: Obsolete API routine Equivalent new API routine alpar@1: lpx_check_name (no more supported) alpar@1: lpx_set_obj_c0 lpx_set_obj_coef alpar@1: lpx_set_row_coef (no more supported) alpar@1: lpx_set_col_coef lpx_set_obj_coef alpar@1: lpx_load_mat (no more supported) alpar@1: lpx_load_mat3 lpx_load_matrix alpar@1: lpx_unmark_all (no more supported) alpar@1: lpx_mark_row (no more supported) alpar@1: lpx_mark_col (no more supported) alpar@1: lpx_clear_mat (no more supported) alpar@1: lpx_del_items lpx_del_rows, lpx_del_cols alpar@1: lpx_get_row_bnds lpx_get_row_type, lpx_get_row_lb, alpar@1: lpx_get_row_ub alpar@1: lpx_get_col_bnds lpx_get_col_type, lpx_get_col_lb, alpar@1: lpx_get_col_ub alpar@1: lpx_get_obj_c0 lpx_get_obj_coef alpar@1: lpx_get_row_coef (no more supported) alpar@1: lpx_get_col_coef lpx_get_obj_coef alpar@1: lpx_get_row_mark (no more supported) alpar@1: lpx_get_col_mark (no more supported) alpar@1: lpx_get_row_info lpx_get_row_stat, lpx_get_row_prim, alpar@1: lpx_get_row_dual alpar@1: lpx_get_col_info lpx_get_col_stat, lpx_get_col_prim, alpar@1: lpx_get_col_dual alpar@1: lpx_get_ips_stat lpx_ipt_status alpar@1: lpx_get_ips_row lpx_ipt_row_prim, lpx_ipt_row_dual alpar@1: lpx_get_ips_col lpx_ipt_col_prim, lpx_ipt_col_dual alpar@1: lpx_get_ips_obj lpx_ipt_obj_val alpar@1: lpx_get_mip_stat lpx_mip_status alpar@1: lpx_get_mip_row lpx_mip_row_val alpar@1: lpx_get_mip_col lpx_mip_col_val alpar@1: lpx_get_mip_obj lpx_mip_obj_val alpar@1: alpar@1: Obsolete API routines were kept for backward compatibility, alpar@1: however, they will be removed in the future. alpar@1: alpar@1: * doc/refman.* alpar@1: New edition of the GLPK reference manual containing description alpar@1: of all new API routines was included. alpar@1: alpar@1: * contrib/glpkmex/*.* alpar@1: GLPKMEX, a Matlab MEX interface to GLPK package, contributed by alpar@1: Nicolo Giorgetti was included. alpar@1: alpar@1: * doc/GLPK_FAQ.txt alpar@1: GLPK FAQ contributed by Harley Mackenzie was alpar@1: included. alpar@1: alpar@1: Fri Dec 12 12:00:00 2003 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.3 has been released. alpar@1: alpar@1: * configure.in alpar@1: The bug, due to which the standard math library is not linked on alpar@1: some platforms, was fixed. alpar@1: alpar@1: * glpmpl3.c alpar@1: The bug (0 ** y) was fixed in the routine fp_power. alpar@1: alpar@1: * glpmpl.h, glpmpl1.c, glpmpl3.c alpar@1: Some new built-in functions (round, trunc, Irand224, Uniform01, alpar@1: Uniform, Normal01, Normal) were added to the MathProg language. alpar@1: alpar@1: * glpmpl1.c alpar@1: The MathProg syntax was changed to allow writing 'subj to'. alpar@1: alpar@1: * glplpx.h, glplpx1.c, glplpx2.c alpar@1: The new api routine lpx_get_ray_info was added. alpar@1: alpar@1: * glplpx8a.c alpar@1: The api routine lpx_print_sol was changed to print the number of alpar@1: non-basic variable, which causes primal unboundness. alpar@1: alpar@1: * glpmps.c alpar@1: The code was changed to avoid errors on compiling the package on alpar@1: Mac OS X. Thanks to Andre Girard for alpar@1: the bug report. alpar@1: alpar@1: * doc/lang.*, doc/refman.* alpar@1: Several typos were fixed and some new material was added in the alpar@1: glpk documentation. alpar@1: alpar@1: Fri Nov 14 12:00:00 2003 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.2 has been released. alpar@1: alpar@1: * glpiet.h, glpiet.c, glpios.h, glpios1.c, glpios2.c, glpios3.c alpar@1: A preliminary implementation of the Integer Optimization Suite alpar@1: (IOS) was included in the package. Eventually IOS will replace alpar@1: the Implicit Enumeration Suite (IES). alpar@1: alpar@1: * glplpx.h, glplpx6d.c alpar@1: A dummy version of the integer optimization routine lpx_intopt alpar@1: was included in the package. Later this routine will replace the alpar@1: routine lpx_integer. alpar@1: alpar@1: * examples/glpsol.c alpar@1: A new command-line option --int-opt was added to the solver to alpar@1: call lpx_intopt rather than lpx_integer. alpar@1: alpar@1: * glpbcs.h, glpbcs1.c, glpbcs2.c alpar@1: Being replaced by IOS routines (see above) the Branch-and-Cut alpar@1: Framework (BCS) routines were removed from the package. alpar@1: alpar@1: * examples/tspsol.c alpar@1: Stand-alone Symmetric TSP solver was completely re-programmed alpar@1: using IOS routines. alpar@1: alpar@1: * glplib.h, glplib2.c, glplib4.c alpar@1: The random-number generator was implemented. It is based on the alpar@1: module GB_FLIB from the Stanford GraphBase originally developed alpar@1: by Donald Knuth. alpar@1: alpar@1: * glphbsm.c, glplpx8a.c, glpmps.c alpar@1: All calls to fopen/fclose were replaced by corresponding calls alpar@1: to ufopen/ufclose due to bug reports provided by Morten Welinder alpar@1: and . alpar@1: alpar@1: * glpmps.c alpar@1: The code was made re-entrant. alpar@1: alpar@1: * glplpx8b.c alpar@1: API routine lpx_print_sens_bnds for bounds sensitivity analysis alpar@1: contributed by Brady Hunsaker was added alpar@1: to the package. This feature is also available in glpsol via the alpar@1: command-line option --bounds. alpar@1: alpar@1: * contrib/jni/*.* alpar@1: New version of GLPK JNI (Java Native Interface) contributed by alpar@1: Chris Rosebrugh was added to the package. alpar@1: alpar@1: * contrib/deli/*.* alpar@1: GLPK DELI (Delphi Interface) contributed by Ivo van Baren alpar@1: was added to the package. alpar@1: alpar@1: * glplpx3.c alpar@1: Default method to scale the problem was changed to equilibration alpar@1: scaling (lp->scale = 1 in lpx_reset_parms). alpar@1: alpar@1: * glplpx6a.c alpar@1: Two minor (non-critical) typos were fixed due to report provided alpar@1: by Andrew Hamilton-Wright . alpar@1: alpar@1: * glplpp2.c alpar@1: An untested case (line 941) had been tested due to bug report alpar@1: provided by Jiri Spitz . alpar@1: alpar@1: * w32bc5.mak, w32vc6.mak, w32vc6d.mak, d32dmc.mak alpar@1: Several makefiles were added to allow building GLPK library for alpar@1: some non-GNU 32-bit platforms. alpar@1: alpar@1: Sat Aug 23 12:00:00 2003 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.1 has been released. alpar@1: alpar@1: * glpmpl1.c, glpmpl3.c alpar@1: Some bugs were fixed in the MathProg translator due to the bug alpar@1: reports provided by Giles Thompson : alpar@1: conditional set expressions were incorrectly parsed; alpar@1: dimen attribute was not set by default when a set was used alpar@1: recursively in its own declaration; alpar@1: logical expressions ... in if ... then ... else ... did not alpar@1: work; alpar@1: displaying set expressions did not free memory allocated for alpar@1: temporary results. alpar@1: alpar@1: * glpmpl3.c (reduce_terms) alpar@1: Implementation of summation of linear forms over domain was alpar@1: improved to reduce complexity of that operation from O(n*n) to alpar@1: O(n*log n). The improvement was made due to a report provided alpar@1: by Sebastien de Menten . alpar@1: alpar@1: * glplpx6a.c (line 1056), glpmip1.c (line 641) alpar@1: Two minor bugs were fixed due to the bug report provided by alpar@1: Kendall Demaree . alpar@1: alpar@1: * glplpx.h, glplpx6a.c alpar@1: The method of one artificial variable implemented in the routine alpar@1: lpx_prim_art and used on the phase I in the glpk simplex solver alpar@1: has a serious defect: for some lp instances it erroneously alpar@1: reports that the problem has no primal feasible solution. This alpar@1: error appears when the column of the artificial variable, which alpar@1: enters the basis to make it primal feasible, has large alpar@1: constraint coefficients, that leads to small reduced costs of alpar@1: non-basic variables and premature termination of the search, alpar@1: i.e. to wrong conclusion that the problem has no primal feasible alpar@1: solution. To avoid this defect the routine lpx_prim_feas was alpar@1: included. It implements the method of implicit artifical alpar@1: variables (based on minimization of the sum of infeasibilities), alpar@1: which is a bit slower but much more robust. The routine alpar@1: lpx_prim_feas having the same functionality now is used instead alpar@1: the routine lpx_prim_art. alpar@1: alpar@1: * glpinv.h, glpinv.c alpar@1: The test used in the routine inv_update to detect low accuracy alpar@1: after updating LU-factorization of the basis matrix was replaced alpar@1: by a new, more robust test. alpar@1: alpar@1: * glplpx6c.c alpar@1: Selecting an active node to be solved next in the routine alpar@1: btrack_bestp was changed. Now, if any integer feasible solution alpar@1: has not been found yet, the routine chooses an active node which alpar@1: has the minimal sum of integer infeasibilities. alpar@1: alpar@1: * glpmip.h, glpmip1.c alpar@1: The additional flag int_obj was included in the structure alpar@1: MIPTREE used by the branch-and-bound. This flag is set in the alpar@1: routine mip_create_tree and used in the routine is_better. It alpar@1: means that the objective is integral, i.e. depends only on alpar@1: integer variables with integer objective coefficients. The test alpar@1: used in the routine check_integrality was also replaced by a alpar@1: new, more reasonable one. alpar@1: alpar@1: * glplpx1.c alpar@1: A minor bug was fixed in the routine lpx_check_name. alpar@1: alpar@1: * glpmpl.h, glpmpl4.c, glplpx8d.c alpar@1: The flag skip_data was added to the parameter list of the alpar@1: routine mpl_read_model. If this flag is set, the data section alpar@1: in the model file is ignored. Corresponding change was made in alpar@1: the routine lpx_read_model. Now, if both model and data files alpar@1: are specified, the data section in the model file is ignored. alpar@1: alpar@1: * glplpx8c.c alpar@1: A minor bug (wrong format used for writing free columns) in the alpar@1: routine lpx_write_lpt was fixed due to the bug report provided alpar@1: by Bernhard Schmidt alpar@1: alpar@1: * sample/glpsol.c alpar@1: The command-line parameter --tmlim, which allows limiting the alpar@1: solution time, was added. alpar@1: alpar@1: * doc/lang.*, doc/refman.* alpar@1: New edition of the GLPK documentation was included. alpar@1: alpar@1: * java-binding/*.* alpar@1: New version of the GLPK JNI (Java Native Interface) package was alpar@1: included in the distribution. alpar@1: alpar@1: * sample/lpglpk40.c alpar@1: A non-trivial example was added. It allows using GLPK as a base alpar@1: LP solver for Concorde, a program for solving Traveling Salesman alpar@1: Problem (TSP). For details see comments in lpglpk40.c. alpar@1: alpar@1: * sample/*.mod alpar@1: Some examples of LP and MIP models written in GNU MathProg were alpar@1: added. alpar@1: alpar@1: Tue May 06 12:00:00 2003 Andrew Makhorin alpar@1: alpar@1: * GLPK 4.0 has been released. alpar@1: alpar@1: * glpmpl.h, glpmpl1.c, glpmpl2.c, glpmpl3.c, glpmpl4.c alpar@1: The model translator for the GNU MathProg modeling language was alpar@1: implemented and included in the package. alpar@1: alpar@1: * glplpx.h, glplpx8d.c alpar@1: The api routine lpx_read_model, which is an interface to the alpar@1: MathProg translator, was included in the package. alpar@1: alpar@1: * glplpx.h, glplpx8a.c alpar@1: The api routine lpx_print_prob for writing LP/MIP problem data alpar@1: in plain text format was included in the package. alpar@1: alpar@1: * sample/glpsol.c alpar@1: New version of the GLPK stand-alone LP/MIP solver that supports alpar@1: the GNU MathProg modeling language was implemented. alpar@1: alpar@1: * doc/lang.latex, doc/lang.dvi, doc/lang.ps alpar@1: The document "GLPK: Modeling Language GNU MathProg" was included alpar@1: in the package. alpar@1: alpar@1: * doc/refman.latex, doc/refman.dvi, doc/refman.ps alpar@1: New edition of the GLPK Reference Manual was included in the alpar@1: package. alpar@1: alpar@1: * glplpx8c.c alpar@1: A bug in the api routine lpx_write_lpt was fixed. Due to that alpar@1: bug an addressing error occured in the routine if the objective alpar@1: function has the non-zero constant term. alpar@1: alpar@1: * glplan.h, glplan1.c, glplan2.c, glplan3.c, glplan4.c, alpar@1: * glplan5.c, glplan6.c, glplan7.c, glplan8.c, glplpx8b.c alpar@1: All modules of the translator for the GLPK/L modeling language alpar@1: were removed from the package, because GLPK/L being completely alpar@1: superseded by GNU MathProg is no more supported. alpar@1: alpar@1: Tue Mar 25 12:00:00 2003 Andrew Makhorin alpar@1: alpar@1: * GLPK 3.3 has been released. alpar@1: alpar@1: * glplpp.h, glplpp1.c, glplpp2.c alpar@1: An implementation of the built-in LP presolver was added to the alpar@1: package. alpar@1: alpar@1: * glplpx.h alpar@1: The flag presol was added to the structure LPX. This flag tells alpar@1: the lpx_simplex whether the built-in LP presolver should be used alpar@1: or not. By default this flag is off. Also three macros (namely alpar@1: LPX_E_NOPFS, LPX_E_NODFS, and LPX_K_PRESOL) that concern using alpar@1: the LP presolver were introduced. alpar@1: alpar@1: * glplpx3.c, glplpx6a.c alpar@1: These modules was changed to use the built-in LP presolver. alpar@1: alpar@1: * sample/glpsol.c alpar@1: Command line options --presol and --nopresol that concern using alpar@1: the LP presolver were added to the stand-alone LP/MIP solver. alpar@1: alpar@1: * glplan1.c alpar@1: This module was changed to allow declaring sets like A[1:10] in alpar@1: the models written in the GLPK/L modeling language. alpar@1: alpar@1: * doc/refman.latex, doc/lang.latex alpar@1: New editions of the documents "GLPK User's Guide" and "GLPK/L alpar@1: Modeling Language" were included in the distribution. alpar@1: alpar@1: * java-binding/*.* alpar@1: The package GLPK JNI (Java Native Interface) implementing Java alpar@1: binding for GLPK was included in the distribution. This package alpar@1: was developed and programmed by Yuri Victorovich . alpar@1: alpar@1: Tue Feb 18 12:00:00 2003 Andrew Makhorin alpar@1: alpar@1: * GLPK 3.2.4 has been released. alpar@1: alpar@1: * glplpx6b.c alpar@1: The code was changed to allow auxiliary variables have non-zero alpar@1: objective coefficients. alpar@1: alpar@1: Also a minor bug was fixed (the constant term was not considered alpar@1: on displaying the objective function value). alpar@1: alpar@1: * sample/glpsol.c alpar@1: The code was changed to fix a bug (the command-line option 'bfs' alpar@1: was not recognized). The bug was fixed due to report provided by alpar@1: Olivier . alpar@1: alpar@1: * glplpt.c alpar@1: The code was changed to fix a bug (binary variables were treated alpar@1: erroneously as integer ones). alpar@1: alpar@1: * glplpx6b.c alpar@1: The code was changed to fix a bug (variables that have no lower alpar@1: bounds were incorrectly processed on converting to the standard alpar@1: formulation). The bug was fixed due to report kindly provided by alpar@1: Kjell Eikland . alpar@1: alpar@1: Mon Nov 11 12:00:00 2002 Andrew Makhorin alpar@1: alpar@1: * GLPK 3.2.3 has been released. alpar@1: alpar@1: * glpmip.h, glpmip1.c alpar@1: A preliminary implementation of the branch-and-bound driver alpar@1: based on the implicit enumeration suite (glpies) was added to alpar@1: the package. This module is not documented yet. alpar@1: alpar@1: * glplpx6c.c alpar@1: A new implementation of the api routine lpx_integer which now alpar@1: is based on the b&b driver (see glpmip above) was included in alpar@1: the package. This new implementation has exactly the same alpar@1: functionality as the old version and therefore all changes are alpar@1: transparent to the api user. alpar@1: alpar@1: * glpbbm.h, glpbbm.c alpar@1: * glprsm.h, glprsm1.c, glprsm2.c alpar@1: * glplp.h, glplp.c alpar@1: These modules were removed from the package, because they were alpar@1: used only in the old version of the routine lpx_integer, which alpar@1: was replaced by the new version (see glplpx6c above). alpar@1: alpar@1: * glplpx.h, glplpx6a.c alpar@1: The api routine lpx_check_kkt was included in the package and alpar@1: its description was added in the reference manual. This routine alpar@1: allows checking Karush-Kuhn-Tucker optimality conditions for an alpar@1: LP solution. alpar@1: alpar@1: * glplpx.h, glplpx8a.c alpar@1: Now the api routine lpx_print_sol also prints information about alpar@1: "solution quality" obtained via the api routine lpx_check_kkt. alpar@1: alpar@1: * glplpx.h, glplpx8a.c alpar@1: New api routines lpx_read_bas and lpx_write_bas were included alpar@1: in the package and documented. The routine lpx_write_bas allows alpar@1: writing a current basis from an LP object to a text file in the alpar@1: MPS format. The routine lpx_read_bas allows reading a basis alpar@1: prepared in the MPS format from a text file into an LP object. alpar@1: alpar@1: * glplpt.c alpar@1: The parsing routine which reads LP problem data prepared in the alpar@1: CPLEX LP format was modified to allow specifying lower bounds alpar@1: of variables also in the form 'variable >= lower bound' (in the alpar@1: bounds section). This modification was made due to a notice alpar@1: provided by Ivan Luzzi . alpar@1: alpar@1: * glplpx.h, glplpx8c.c alpar@1: The api routine lpx_write_lpt which allows writing LP problem alpar@1: data from an LP object to a text file using the CPLEX LP format alpar@1: was included in the package and documented. alpar@1: alpar@1: * glplpx.h, glplpx3.c alpar@1: The control parameter LPX_K_LPTORIG that affects the behavior alpar@1: of the api routine lpx_write_lpt was introduced. alpar@1: alpar@1: * glplan6.c alpar@1: The semantics of the language GLPK/L was changed to allow alpar@1: selection in case when not all mute letters of a predicate (the alpar@1: operand that follows the keyword 'where') are presented in a alpar@1: parameter (the operand that precedes the keyword 'where'), i.e. alpar@1: to allow writing something like this: alpar@1: y[j] := sum(i, x[i] where p[i,j]); alpar@1: The paragraph "Selection" in the langauge description (page 25) alpar@1: was also correspondingly changed. This change of the language alpar@1: semantics was undertaken due to a notice provided by Peter Lee alpar@1: . alpar@1: alpar@1: * sample/hwd.lpm alpar@1: A nice example of LP model written in GLPK/L and contributed by alpar@1: Peter Lee was included in the package. alpar@1: alpar@1: * glplpx6b.c alpar@1: The api routine lpx_interior was modified: a) to compute dual alpar@1: values for all structural as well as auxiliary variables; b) to alpar@1: allow specifying non-zero objective coefficients at auxiliary alpar@1: variables. alpar@1: alpar@1: * sample/glpsol.c alpar@1: Three new command-line options were added to the solver, which alpar@1: are: --plain, --orig, and --wrlpt. alpar@1: alpar@1: Mon Oct 14 12:00:00 2002 Andrew Makhorin alpar@1: alpar@1: * GLPK 3.2.2 has been released. alpar@1: alpar@1: * glplpt.h, glplpt.c alpar@1: A module that reads LP/MIP problem data in CPLEX LP format was alpar@1: implemented. alpar@1: alpar@1: * glplpx8c.c alpar@1: An api routine lpx_read_lpt that reads LP/MIP problem data in alpar@1: CPLEX LP format was implemented. alpar@1: alpar@1: * sample/glpsol.c, sample/plan.lpt alpar@1: A new command-line option '--lpt' that allows reading LP/MIP alpar@1: problem data in CPLEX LP format was added to the solver. alpar@1: alpar@1: * doc/refman.latex, doc/refman.dvi, doc/refman.ps alpar@1: A new edition of the Reference Manual was included. alpar@1: alpar@1: * source/*.c alpar@1: Casting to (unsigned char) was added in some calls to the alpar@1: classification functions (isalpha, etc.). The bug was fixed due alpar@1: to report provided by Morten Welinder . alpar@1: alpar@1: * glplpx8a.c alpar@1: The local routine mps_numb used in the routine lpx_write_mps alpar@1: was modified to correctly format floating-point numbers that alpar@1: have two digits in the decimal exponent. The bug was fixed due alpar@1: to report provided by Vlahos Kiriakos . alpar@1: alpar@1: * glplan.h, glplan1.c, ..., glplan8.c alpar@1: Several serious bugs were fixed in the language processor due alpar@1: to reports provided by : alpar@1: (a) a static search tree used to find sparse array elements was alpar@1: sometimes overwritten that caused the message 'assertion failed' alpar@1: to appear; the bug was fixed by creating separate search trees alpar@1: in parsing routines; (b) a variable declared using the alpar@1: predicate-controlled variable declaration statement had wrong alpar@1: order of domain sets, because the variable array was built as alpar@1: a copy of the predicate array; the bug was fixed by using the alpar@1: internal routine transpose that coordinates mute letters (and alpar@1: therefore domain sets) on copying sparse arrays; (c) sometimes alpar@1: assignment statements like x[#a,#b,#c] := ... was incorrectly alpar@1: processed; the bug was fixed by including an appropriate check alpar@1: into the internal routine assign_stmt. alpar@1: alpar@1: * glp_simplex.c alpar@1: An additional check to see if all lower bounds are not greater alpar@1: than corresponding upper bounds was included in the routine to alpar@1: prevent wrong results to appear. Such incorrectness sometimes alpar@1: was not detected, namely, when variables with such bounds were alpar@1: non-basic and never entered the basis. alpar@1: alpar@1: * glpspx1.c alpar@1: Maximal number of simplex iterations before reinversion was alpar@1: decreased from 100 to 50. This allowed to improve accuracy and, alpar@1: that is more important, to reduce the solution time for many alpar@1: serial lp problems approximately 1.5--2 times. alpar@1: alpar@1: * glpspx2.c alpar@1: A check to see if all elements in the column chosen to enter alpar@1: the basis are close to zero in the routine spx_prim_chuzr was alpar@1: temporarily removed because this check gave wrong conclusion in alpar@1: case when the corresponding non-basic variable had zero column alpar@1: in the constraint matrix. An analogous check to see if all alpar@1: elements in the row chosen to leave the basis are close to zero alpar@1: in the routine spx_dual_chuzc was also temporarily removed on alpar@1: the same reason. The bug was fixed due to reports provided by alpar@1: Flavio Keidi Miyazawa and Vlahos Kiriakos alpar@1: . alpar@1: alpar@1: Mon Aug 12 12:00:00 2002 Andrew Makhorin alpar@1: alpar@1: * GLPK 3.2.1 has been released. alpar@1: alpar@1: * glpbcs.h, glpbcs1.c, glpbcs2.c alpar@1: * glpies.h, glpies1.c, glpies2.c, glpies3.c alpar@1: A preliminary implementation of the branch-and-cut framework alpar@1: was included in the package. alpar@1: alpar@1: * doc/brcut.txt alpar@1: The document "GLPK: A Preliminary Implementation of the alpar@1: Branch-And-Cut Framework" was included in the distribution. alpar@1: alpar@1: * sample/tspsol.c alpar@1: An illustrative program for solving symmetric TSP based on the alpar@1: branch-and-cut method was included in the package. alpar@1: alpar@1: * glpdmp.h, glpdmp.c alpar@1: A new, re-enterable version of routines for managing dynamic alpar@1: memory pools was included in the package. alpar@1: alpar@1: * glpavl.h, glpavl.c alpar@1: A new, re-enterable version of routines for managing AVL search alpar@1: trees was included in the package. alpar@1: alpar@1: * glplib.h, glplib2.c alpar@1: Two new low-level routines ufopen and ufclose were included in alpar@1: the package. alpar@1: alpar@1: * glplpx.h, glplpx7.c alpar@1: The following new api routines were added: lpx_eval_activity, alpar@1: lpx_eval_red_cost, lpx_reduce_form, lpx_mixed_gomory. alpar@1: alpar@1: * glptsp.h, glptsp.c alpar@1: A module for reading TSP data using TSPLIB format was included alpar@1: in the package. alpar@1: alpar@1: Mon Jul 15 12:00:00 2002 Andrew Makhorin alpar@1: alpar@1: * GLPK 3.2 has been released. alpar@1: alpar@1: * glplpx.h, glplpx1.c, glplpx2.c alpar@1: The identifier 'class' (used as a member name in the structure alpar@1: LPX and as an argument name in the routine lpx_set_class) was alpar@1: changed to 'clss' in order to avoid conflicts with C++ reserved alpar@1: words. alpar@1: alpar@1: * glpk.h, glplpx.h, glplpx1.c, glplpx2.c, glplpx6a.c, alpar@1: * glplpx6b.c, glplpx6c.c, glplpx7.c, glplpx8.c alpar@1: The following new api routines were added: lpx_set_obj_name, alpar@1: lpx_get_obj_name, lpx_get_row_mark, lpx_get_col_mark, alpar@1: lpx_transform_row, lpx_transform_col, lpx_prim_ratio_test, alpar@1: lpx_dual_ratio_test, lpx_interior, lpx_get_ips_stat, alpar@1: lpx_get_ips_row, lpx_get_ips_col, lpx_get_ips_obj, lpx_read_lpm, alpar@1: lpx_write_mps, lpx_print_ips. alpar@1: alpar@1: * glpsol.c alpar@1: The solver was completely re-programmed using new api routines. alpar@1: alpar@1: * lang.latex, lang.dvi, lang.ps alpar@1: New edition of the document "GLPK: Modeling Language GLPK/L" alpar@1: was included in the distribution. alpar@1: alpar@1: * refman.latex, refman.dvi, refman.ps alpar@1: New edition of the document "GLPK: Reference Manual" (which alpar@1: contains descriptions of all new api routines) was included in alpar@1: the distribution. alpar@1: alpar@1: * glpapi.h, glpapi1.c, glpapi2.c, glpapi3.c, glpapi4.c alpar@1: These files (which contain old api routines) were removed from alpar@1: the package. alpar@1: alpar@1: * glpipm1.c, glpipm2.c alpar@1: The file glpipm1.c was renamed to glpipm.c. The file glpipm2.c alpar@1: was used only by old api routines and therefore was removed from alpar@1: the package. alpar@1: alpar@1: * language.texinfo alpar@1: Old version of the document "GLPK: Modeling Language GLPK/L" was alpar@1: removed from the distribution. alpar@1: alpar@1: Mon May 27 12:00:00 2002 Andrew Makhorin alpar@1: alpar@1: * GLPK 3.1 has been released. alpar@1: alpar@1: * glplpx.h, glplpx1.c, glplpx2.c, glplpx3.c, glplpx4.c, alpar@1: * glplpx5.c, glplpx6.c, glplpx7.c, glplpx8.c alpar@1: A preliminary implementation of new API routines was completed. alpar@1: alpar@1: * refman.latex, refman.dvi, refman.ps alpar@1: A draft edition of the document "GLPK Reference Manual", which alpar@1: describes new API routines, was included. alpar@1: alpar@1: * glplib3.c alpar@1: A bug in measuring long time intervals was fixed up. alpar@1: alpar@1: * glprsm3.c alpar@1: This module contains some obsolete routines not longer used and alpar@1: therefore it was removed from the package (into the subdirectory alpar@1: 'oldsrc'). alpar@1: alpar@1: * glprsm.h alpar@1: Some declarations related to the module 'glprsm3.c' (see above) alpar@1: were removed. alpar@1: alpar@1: * guide.texinfo alpar@1: The document "GLPK User's Guide" describing old API routines was alpar@1: removed from the package (into the subdirectory 'oldsrc'). alpar@1: alpar@1: * newapi.txt alpar@1: The document "New GLPK API Routines" was removed at all, because alpar@1: it is superseded by the new reference manual (see above). alpar@1: alpar@1: Mon May 13 12:00:00 2002 Andrew Makhorin alpar@1: alpar@1: * GLPK 3.0.8 has been released. alpar@1: alpar@1: * glplpx.h, glplpx1.c, glplpx2.c, glplpx3.c, glplpx4.c, alpar@1: * glplpx5.c, glplpx6.c, glplpx7.c alpar@1: A preliminary (currently incomplete) implementation of new api alpar@1: routines was included. alpar@1: alpar@1: * sample/newsamp.c alpar@1: A sample program for the new api routines was included. alpar@1: alpar@1: * newapi.txt alpar@1: A draft of the document "New GLPK API Routines" was included. alpar@1: alpar@1: * glpapi2.c, glpapi5.c, glpapi6.c alpar@1: These modules (which contain the api routines glp_call_rsm1, alpar@1: glp_simplex1, glp_pivot_in, glp_pivot_out) were removed from the alpar@1: package (to the subdirectory 'oldsrc') since these routines are alpar@1: functionally superseded by the new api routines. alpar@1: alpar@1: * glpk.h, glpapi2.c, glpapi3.c, glpapi4.c alpar@1: The api routines glp_simplex2, glp_call_ipm1, glp_call_bbm1 were alpar@1: renamed to glp_simplex, glp_interior, glp_integer, respectively. alpar@1: alpar@1: * sample/glpsol.c alpar@1: Some command-line options (which got obsolete due to the recent alpar@1: changes in api) were excluded. alpar@1: alpar@1: * doc/guide.texinfo alpar@1: New edition of the document "GLPK User's Guide" was included in alpar@1: the distribution to reflect the changes in some api routines. alpar@1: alpar@1: * doc/libref.texinfo alpar@1: This document was removed from the package (to the subdirectory alpar@1: 'oldsrc') since it describes the library routines, most of which alpar@1: got obsolete and no longer used. alpar@1: alpar@1: * Makefile.in alpar@1: A minor bug was fixed up due to bug report from Hans Schwengeler alpar@1: . alpar@1: alpar@1: Mon Apr 22 12:00:00 2002 Andrew Makhorin alpar@1: alpar@1: * GLPK 3.0.7 has been released. alpar@1: alpar@1: * glpduff.h, glpduff.c, glpspx.h, glpspx1.c, glpspx2.c, alpar@1: * glpapi7.c alpar@1: These modules were replaced by a new implementation of the alpar@1: simplex method and therefore they were removed from the package alpar@1: (however they still can be found in the subdirectory 'oldsrc'). alpar@1: alpar@1: * glprsm1.c alpar@1: The routine crash_aa was replaced by a new implementation and alpar@1: therefore it was removed from the file 'glprsm1.c'. alpar@1: alpar@1: * glplpx.h, glplpx.c, glpspx.h, glpspx1.c, glpspx2.c, glpspx3.c, alpar@1: * glpspx4.c, glpapi7.c alpar@1: New (currently incomplete) implementation of the simplex method alpar@1: components was included in the package. alpar@1: alpar@1: Thu Mar 28 12:00:00 2002 Andrew Makhorin alpar@1: alpar@1: * GLPK 3.0.6 has been released. alpar@1: alpar@1: * glpluf.h, glpluf.c, glpinv.h, glpinv.c alpar@1: New version of LU-factorization and basis maintenance routines alpar@1: (based on Forrest-Tomlin updating technique) was implemented. alpar@1: alpar@1: * glpeta.h, glpeta.c, glpfhv.h, glpfhv.c, glpgel.h, glpgel.c, alpar@1: * glppfi.h, glppfi.c, glprfi.h, glprfi.c alpar@1: These routines implement some other forms of the basis matrix. alpar@1: Now they became obsolete being functionally superseded by the alpar@1: new version of basis maintenance routines (see above) and were alpar@1: removed from the package (however they still can be found in the alpar@1: subdirectory 'oldsrc'). alpar@1: alpar@1: * glpbbm.c, glprsm.h, glprsm1.h, glprsm2.h, glpspx.h, glpspx2.c, alpar@1: * glprsm2.c, glpsol.c alpar@1: Necessary changes were made in order to use the new version of alpar@1: basis maintenance routines. alpar@1: alpar@1: Tue Jan 29 12:00:00 2002 Andrew Makhorin alpar@1: alpar@1: * GLPK 3.0.5 has been released. alpar@1: Structure of the package was re-organized in order to simplify alpar@1: its maintenance. alpar@1: alpar@1: * doc/guide.texinfo alpar@1: New edition of the document "GLPK User's Guide" was included in alpar@1: the distribution. Now the document includes descriptions of some alpar@1: additional API routines recently added to the package. alpar@1: alpar@1: * doc/newapi.txt alpar@1: The document "Additional GLPK API Routines" was removed from the alpar@1: distribution, because the corresponding material was included in alpar@1: the user's guide (see above). alpar@1: alpar@1: Mon Dec 10 12:00:00 2001 Andrew Makhorin alpar@1: alpar@1: * GLPK 3.0.4 has been released. alpar@1: alpar@1: * glpspx.h, glpspx1.c, glpspx2.c, glpapi/glp_simplex2.h alpar@1: A new, more efficient version of the two-phase primal simplex alpar@1: method was implemented (advanced initial basis, projected alpar@1: steepest edge, recursive computations of solution components). alpar@1: alpar@1: * glpapi/glp_call_bbm1.c alpar@1: Now LP relaxation can be solved either using rsm1_driver(), or alpar@1: using glp_simplex2(). The choice is controlled by the parameter alpar@1: 'meth' (a member of struct bbm1). alpar@1: alpar@1: * sample/glpsol.c alpar@1: The new implementation of the simplex method is now used by alpar@1: default. The old version is available via --old-sim option. alpar@1: alpar@1: * glpmat/gm_scaling.c alpar@1: Now this routine displays only two lines: an initial "quality" alpar@1: and a final "quality". alpar@1: alpar@1: * glplp/prepro_lp.c alpar@1: Identifiers 'fmin' and 'fmax' renamed to 'f_min' and 'f_max' in alpar@1: order to avoid conflict with . The bug was fixed due to alpar@1: report provided by Sami Farin . alpar@1: alpar@1: Wed Oct 03 12:00:00 2001 Andrew Makhorin alpar@1: alpar@1: * GLPK 3.0.3 has been released. alpar@1: alpar@1: * glprsm/harris_row.c, glprsm/harris_col.c alpar@1: The relative tolerance used on the first pass of the two-pass alpar@1: ratio test was replaced by the absolute tolerance. alpar@1: alpar@1: * glprsm/rsm_primal.c, glprsm/rsm_feas.c, glprsm/rsm_dual.c alpar@1: The absolute tolerance passed to the two-pass ratio test routine alpar@1: was decaresed (for both primal and dual simplex). alpar@1: alpar@1: These changes were made in order to improve numerical stability alpar@1: of the simplex method. alpar@1: alpar@1: * glprsm/glp_call_rsm1.c, glprsm/glp_call_bbm1.c, alpar@1: * glprsm/glp_simplex1, glprsm/glp_pivoting.c alpar@1: Default form of the inverse was changed from RFI to AFI. alpar@1: alpar@1: Mon Sep 24 12:00:00 2001 Andrew Makhorin alpar@1: alpar@1: * GLPK 3.0.2 has been released. alpar@1: alpar@1: * glpfhv.h, glpfhv.c alpar@1: New version of the basis maintaining routines was implemented. alpar@1: These routines, which are based on so called FHV-factorization alpar@1: (a variety of LU-factorization) and Gustavson's data structures, alpar@1: perform the main operations on the basis matrix faster at the alpar@1: expense of some worsening numerical accuracy. alpar@1: alpar@1: * glprsm.h, glprsm/afi.c alpar@1: The routines, which implement AFI (Advanced Form of the alpar@1: Inverse) based on FHV-factorization, were added to the package. alpar@1: This new form is available via the parameter form = 3 (on API alpar@1: level) or via the option --afi (in GLPSOL solver). alpar@1: alpar@1: * EFI was renamed to PFI alpar@1: In order to correct terminology the acronym EFI (Elimination alpar@1: Form of the Inverse) was replaced by PFI (Product Form of the alpar@1: Inverse) everywhere in the source code and the documentation. alpar@1: alpar@1: * glpset/umalloc.c, glpset/ucalloc.c alpar@1: * glpset/get_atom.c, glpset/get_atomv.c alpar@1: These memory management routines were changed in order *not* to alpar@1: clear allocated memory blocks by binary zeros. alpar@1: alpar@1: Wed Aug 01 12:00:00 2001 Andrew Makhorin alpar@1: alpar@1: * GLPK 3.0.1 has been released. alpar@1: alpar@1: * glpapi/old_api.c, glplp/extract_lp.c, store_lpsol.c alpar@1: Old API routines were deleted from the package. alpar@1: alpar@1: * include/glpk.h, include/glpapi.h, include/glplp.h alpar@1: Specifications of old API routines and data structures were alpar@1: removed from the headers. alpar@1: alpar@1: * sample/glpsol.c alpar@1: New version of the stand-alone solver GLPSOL that now uses new alpar@1: API routines was implemented. alpar@1: alpar@1: * glpapi/glp_set_row_fctr.c, glpapi/glp_set_col_fctr.c, alpar@1: * glpapi/glp_get_row_fctr.c, glpapi/glp_get_col_fctr.c, alpar@1: * glpapi/glp_scale_prob.c alpar@1: Scaling routines were added. alpar@1: alpar@1: * glpapi/glp_write_mps.c alpar@1: The routine for writing problem data in MPS format was added. alpar@1: alpar@1: * glpapi/glp_simplex1.c alpar@1: Comprehensive driver to the simplex method was added. alpar@1: alpar@1: * glpapi/glp_pivoting.c alpar@1: The routines glp_pivot_in() and glp_pivot_out() intended for alpar@1: basis maintaining were added. alpar@1: alpar@1: * glprsm/create_rsm.c, glprsm/delete_rsm.c, glprsm/scale_rsm.c, alpar@1: * glprsm/build_basis.c alpar@1: Additional low level routines related to the simplex method alpar@1: were added. alpar@1: alpar@1: * glpk.h, glpapi.h, glprsm.h alpar@1: Additional specifications for new routines and data structures alpar@1: were added. alpar@1: alpar@1: * sample/lpglpk30.c alpar@1: A non-trivial example was added. It allows using GLPK as a base alpar@1: LP solver for Concorde, a program for solving Traveling Salesman alpar@1: Problem (TSP). For details see comments in 'lpglpk30.c'. alpar@1: alpar@1: * doc/newapi.txt alpar@1: The document "Additional GLPK API Routines" that describes some alpar@1: new API routines was included. alpar@1: alpar@1: Thu Jul 19 12:00:00 2001 Andrew Makhorin alpar@1: alpar@1: * GLPK 3.0 has been released. alpar@1: alpar@1: Now GLPK is provided with new API, which is intended for using alpar@1: the package in more complex algorithmic schemes. alpar@1: alpar@1: * glpapi/old_api.c alpar@1: All routines related to old API were gathered in one file named alpar@1: 'old_api.c'. alpar@1: alpar@1: * glpapi/*.c alpar@1: These routines that implement new API were added to the package. alpar@1: alpar@1: * include/glpk.h, include/glpapi.h alpar@1: Specifications of new API routines and data structures were alpar@1: added to these headers. Specifications of old API routines and alpar@1: data structures were locked by #ifdef GLP_OLD_API directive. alpar@1: alpar@1: * doc/guide.texinfo alpar@1: New edition of the document "GLPK User's Guide" that correspond alpar@1: to new API was included. alpar@1: alpar@1: Thu Jun 14 12:00:00 2001 Andrew Makhorin alpar@1: alpar@1: * GLPK 2.4.1 has been released. alpar@1: alpar@1: * doc/glpk_ml.texinfo alpar@1: The new document "Modeling Language GLPK/L" was included. alpar@1: alpar@1: * doc/glpk_ug.texinfo alpar@1: New edition of the document "GLPK User's Guide" was included. alpar@1: alpar@1: * doc/language.txt alpar@1: The preliminary document "GLPK/L Modeling Language: A Brief alpar@1: description" was removed from the distribution, because it has alpar@1: been replaced by the new document "Modeling Language GLPK/L". alpar@1: alpar@1: * glplang/l_spar.c alpar@1: The routine comparison() was re-programmed in order to alpar@1: implement the relation operation as specified in the language alpar@1: description. alpar@1: alpar@1: * glpmip.h, glpmip/*.c alpar@1: The partition 'glpmip' was renamed to 'glpbbm'. alpar@1: alpar@1: Thu May 10 12:00:00 2001 Andrew Makhorin alpar@1: alpar@1: * GLPK 2.4 has been released. alpar@1: alpar@1: Now GLPK includes an implementation of a preliminary version of alpar@1: the GLPK/L modeling language. alpar@1: alpar@1: * glplang.h, glplang/*.c alpar@1: The header 'glplang.h' and a set of routines that implements alpar@1: the GLPK/L language processor (the partition 'glplang') were alpar@1: added to the package. alpar@1: alpar@1: * doc/language.txt alpar@1: The document "GLPK/L Modeling Language: A Brief Description alpar@1: (Supplement to GLPK User's Guide)" in plain text format was alpar@1: included in the package (see the file 'language.txt' in the alpar@1: subdirectory 'doc' of the distribution). alpar@1: alpar@1: * ex/model1.lpm, ex/model2.lpm alpar@1: Two examples of model descriptions written in GLPK/L were added alpar@1: to the package. alpar@1: alpar@1: * sample/glpsol.c alpar@1: This program was modified in order: a) to allow processing alpar@1: model description written in GLPK/L; b) to allow solving pure alpar@1: LP problem using the interior point method. alpar@1: alpar@1: * sample/glpipm.c alpar@1: This program was removed from the package, because its function alpar@1: was passed to the GLPSOL solver. alpar@1: alpar@1: * Makefile.in alpar@1: This file was changed in order to install the GLPSOL solver alpar@1: executable. alpar@1: alpar@1: Mon Apr 09 12:00:00 2001 Andrew Makhorin alpar@1: alpar@1: * GLPK 2.3 has been released. alpar@1: alpar@1: * glpmip.h, glpmip/*.c alpar@1: These routines (that implement the branch-and-bound method) were alpar@1: re-programmed in order to improve robustness of implementation. alpar@1: In particular, heuristic routines were carried out from the main alpar@1: driver routine. alpar@1: alpar@1: Additional GLPK API routines were documented. alpar@1: alpar@1: New edition of the document "GLPK User's Guide" was included in alpar@1: the package. alpar@1: alpar@1: The preliminary document "Mixed Integer Programming Using GLPK alpar@1: Version 2.2 (Supplement to GLPK User's Guide)" was removed from alpar@1: the package, because this material was included in GLPK User's alpar@1: Guide. alpar@1: alpar@1: Thu Mar 15 12:00:00 2001 Andrew Makhorin alpar@1: alpar@1: * GLPK 2.2 has been released. alpar@1: alpar@1: Now GLPK includes a tentative implementation of the alpar@1: branch-and-bound procedure based on the dual simplex method for alpar@1: mixed integer linear programming (MIP). alpar@1: alpar@1: The preliminary document "Mixed Integer Programming Using GLPK alpar@1: Version 2.2 (Supplement to GLPK User's Guide)" was included into alpar@1: the package in plain text format (see the file 'mip.txt' in the alpar@1: subdirectory 'doc' of the distribution). alpar@1: alpar@1: * glpmip.h, glpmip/*.c, glpapi/glp_integer.c alpar@1: These routines (that implement the branch-and-bound method) were alpar@1: added to the package. alpar@1: alpar@1: * sample/glpsol.c alpar@1: This program was modified in order to allow solving LP and MIP alpar@1: problems. alpar@1: alpar@1: * glprsm/rsm_primal.c, glprsm/rsm_dual.c, glprsm/rsm_feas.c, alpar@1: * glprsm/rsm1_driver.c alpar@1: These routines (which are drivers to basic components of the alpar@1: revised simplex method) were added to the package. alpar@1: alpar@1: Mon Feb 19 12:00:00 2001 Andrew Makhorin alpar@1: alpar@1: * GLPK 2.1 has been released. alpar@1: alpar@1: * glprsm.h, glprsm/*.c alpar@1: These routines (that implement components of the revised simplex alpar@1: method) were re-programmed and documented. alpar@1: alpar@1: The document "GLPK Implementation of the Revised Simplex Method" alpar@1: was included into the package. alpar@1: alpar@1: Thu Jan 25 12:00:00 2001 Andrew Makhorin alpar@1: alpar@1: * GLPK 2.0 has been released. alpar@1: alpar@1: Now GLPK includes a tentative implementation of the primal-dual alpar@1: interior point method for large-scale linear programming (for alpar@1: more details see the file `NEWS' in the distribution). A number alpar@1: of routines related to the interior point method were added to alpar@1: the package. alpar@1: alpar@1: * insist.c alpar@1: The routine `insist' and the macro of the same name were alpar@1: introduced into the package in order to replace the standard alpar@1: macro `assert'. Some routines require the expression specified alpar@1: in the `assert' macro to be evaluated, but compiling the package alpar@1: with NDEBUG option prevents from that. This bug was fixed due to alpar@1: bug report provided by Peter A. Huegler . alpar@1: alpar@1: * Makefile.in alpar@1: Minor bug was fixed due to a patch provided by Alexandre Oliva alpar@1: . alpar@1: alpar@1: Wed Jan 10 12:00:00 2001 Andrew Makhorin alpar@1: alpar@1: * GLPK 1.1.2 has been released. alpar@1: alpar@1: * umalloc.c, ufree.c, create_pool.c, get_atom.c, get_atomv.c alpar@1: These routines were changed in order to fix a bug due to alpar@1: report provided by Andrew Hood . Because of alpar@1: this bug data alignment error occured on the Sparc computer. alpar@1: alpar@1: Tue Dec 14 12:00:00 2000 Andrew Makhorin alpar@1: alpar@1: * GLPK 1.1.1 has been released. alpar@1: alpar@1: Minor bug was fixed in `Makefile.in'. alpar@1: alpar@1: GLPK Library Reference was included. alpar@1: alpar@1: Mon Nov 27 12:00:00 2000 Andrew Makhorin alpar@1: alpar@1: * GLPK 1.1 has been released. alpar@1: alpar@1: Minor changes were made in order to co-ordinate GLPK routines alpar@1: and their descriptions. alpar@1: alpar@1: GLPK User's Guide was included. alpar@1: alpar@1: Fri Oct 20 12:00:00 2000 Andrew Makhorin alpar@1: alpar@1: * GLPK 1.0 has been released.