|
1 /* glplpx03.c (OPB format) */ |
|
2 |
|
3 /*********************************************************************** |
|
4 * This code is part of GLPK (GNU Linear Programming Kit). |
|
5 * |
|
6 * Author: Oscar Gustafsson <oscarg@isy.liu.se>. |
|
7 * |
|
8 * Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, |
|
9 * 2009, 2010 Andrew Makhorin, Department for Applied Informatics, |
|
10 * Moscow Aviation Institute, Moscow, Russia. All rights reserved. |
|
11 * E-mail: <mao@gnu.org>. |
|
12 * |
|
13 * GLPK is free software: you can redistribute it and/or modify it |
|
14 * under the terms of the GNU General Public License as published by |
|
15 * the Free Software Foundation, either version 3 of the License, or |
|
16 * (at your option) any later version. |
|
17 * |
|
18 * GLPK is distributed in the hope that it will be useful, but WITHOUT |
|
19 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
|
20 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
|
21 * License for more details. |
|
22 * |
|
23 * You should have received a copy of the GNU General Public License |
|
24 * along with GLPK. If not, see <http://www.gnu.org/licenses/>. |
|
25 ***********************************************************************/ |
|
26 |
|
27 #define _GLPSTD_ERRNO |
|
28 #define _GLPSTD_STDIO |
|
29 #include "glpapi.h" |
|
30 #if 0 /* 24/XII-2009; by mao */ |
|
31 #include "glpipp.h" |
|
32 #endif |
|
33 |
|
34 /*---------------------------------------------------------------------- |
|
35 -- lpx_write_pb - write problem data in (normalized) OPB format. |
|
36 -- |
|
37 -- *Synopsis* |
|
38 -- |
|
39 -- #include "glplpx.h" |
|
40 -- int lpx_write_pb(LPX *lp, const char *fname, int normalized, |
|
41 -- int binarize); |
|
42 -- |
|
43 -- *Description* |
|
44 -- |
|
45 -- The routine lpx_write_pb writes problem data in OPB format |
|
46 -- to an output text file whose name is the character string fname. |
|
47 -- If normalized is non-zero the output will be generated in a |
|
48 -- normalized form with sequentially numbered variables, x1, x2 etc. |
|
49 -- If binarize, any integer variable will be repalzec by binary ones, |
|
50 -- see ipp_binarize |
|
51 -- |
|
52 -- *Returns* |
|
53 -- |
|
54 -- If the operation was successful, the routine returns zero. Otherwise |
|
55 -- the routine prints an error message and returns non-zero. */ |
|
56 |
|
57 #if 1 /* 24/XII-2009; by mao (disabled, because IPP was removed) */ |
|
58 int lpx_write_pb(LPX *lp, const char *fname, int normalized, |
|
59 int binarize) |
|
60 { xassert(lp == lp); |
|
61 xassert(fname == fname); |
|
62 xassert(normalized == normalized); |
|
63 xassert(binarize == binarize); |
|
64 xprintf("lpx_write_pb: sorry, currently this operation is not ava" |
|
65 "ilable\n"); |
|
66 return 1; |
|
67 } |
|
68 #else |
|
69 int lpx_write_pb(LPX *lp, const char *fname, int normalized, |
|
70 int binarize) |
|
71 { |
|
72 FILE* fp; |
|
73 int m,n,i,j,k,o,nonfree=0, obj_dir, dbl, *ndx, row_type, emptylhs=0; |
|
74 double coeff, *val, bound, constant/*=0.0*/; |
|
75 char* objconstname = "dummy_one"; |
|
76 char* emptylhsname = "dummy_zero"; |
|
77 |
|
78 /* Variables needed for possible binarization */ |
|
79 /*LPX* tlp;*/ |
|
80 IPP *ipp = NULL; |
|
81 /*tlp=lp;*/ |
|
82 |
|
83 if(binarize) /* Transform integer variables to binary ones */ |
|
84 { |
|
85 ipp = ipp_create_wksp(); |
|
86 ipp_load_orig(ipp, lp); |
|
87 ipp_binarize(ipp); |
|
88 lp = ipp_build_prob(ipp); |
|
89 } |
|
90 fp = fopen(fname, "w"); |
|
91 |
|
92 if(fp!= NULL) |
|
93 { |
|
94 xprintf( |
|
95 "lpx_write_pb: writing problem in %sOPB format to `%s'...\n", |
|
96 (normalized?"normalized ":""), fname); |
|
97 |
|
98 m = glp_get_num_rows(lp); |
|
99 n = glp_get_num_cols(lp); |
|
100 for(i=1;i<=m;i++) |
|
101 { |
|
102 switch(glp_get_row_type(lp,i)) |
|
103 { |
|
104 case GLP_LO: |
|
105 case GLP_UP: |
|
106 case GLP_FX: |
|
107 { |
|
108 nonfree += 1; |
|
109 break; |
|
110 } |
|
111 case GLP_DB: |
|
112 { |
|
113 nonfree += 2; |
|
114 break; |
|
115 } |
|
116 } |
|
117 } |
|
118 constant=glp_get_obj_coef(lp,0); |
|
119 fprintf(fp,"* #variables = %d #constraints = %d\n", |
|
120 n + (constant == 0?1:0), nonfree + (constant == 0?1:0)); |
|
121 /* Objective function */ |
|
122 obj_dir = glp_get_obj_dir(lp); |
|
123 fprintf(fp,"min: "); |
|
124 for(i=1;i<=n;i++) |
|
125 { |
|
126 coeff = glp_get_obj_coef(lp,i); |
|
127 if(coeff != 0.0) |
|
128 { |
|
129 if(obj_dir == GLP_MAX) |
|
130 coeff=-coeff; |
|
131 if(normalized) |
|
132 fprintf(fp, " %d x%d", (int)coeff, i); |
|
133 else |
|
134 fprintf(fp, " %d*%s", (int)coeff, |
|
135 glp_get_col_name(lp,i)); |
|
136 |
|
137 } |
|
138 } |
|
139 if(constant) |
|
140 { |
|
141 if(normalized) |
|
142 fprintf(fp, " %d x%d", (int)constant, n+1); |
|
143 else |
|
144 fprintf(fp, " %d*%s", (int)constant, objconstname); |
|
145 } |
|
146 fprintf(fp,";\n"); |
|
147 |
|
148 if(normalized && !binarize) /* Name substitution */ |
|
149 { |
|
150 fprintf(fp,"* Variable name substitution:\n"); |
|
151 for(j=1;j<=n;j++) |
|
152 { |
|
153 fprintf(fp, "* x%d = %s\n", j, glp_get_col_name(lp,j)); |
|
154 } |
|
155 if(constant) |
|
156 fprintf(fp, "* x%d = %s\n", n+1, objconstname); |
|
157 } |
|
158 |
|
159 ndx = xcalloc(1+n, sizeof(int)); |
|
160 val = xcalloc(1+n, sizeof(double)); |
|
161 |
|
162 /* Constraints */ |
|
163 for(j=1;j<=m;j++) |
|
164 { |
|
165 row_type=glp_get_row_type(lp,j); |
|
166 if(row_type!=GLP_FR) |
|
167 { |
|
168 if(row_type == GLP_DB) |
|
169 { |
|
170 dbl=2; |
|
171 row_type = GLP_UP; |
|
172 } |
|
173 else |
|
174 { |
|
175 dbl=1; |
|
176 } |
|
177 k=glp_get_mat_row(lp, j, ndx, val); |
|
178 for(o=1;o<=dbl;o++) |
|
179 { |
|
180 if(o==2) |
|
181 { |
|
182 row_type = GLP_LO; |
|
183 } |
|
184 if(k==0) /* Empty LHS */ |
|
185 { |
|
186 emptylhs = 1; |
|
187 if(normalized) |
|
188 { |
|
189 fprintf(fp, "0 x%d ", n+2); |
|
190 } |
|
191 else |
|
192 { |
|
193 fprintf(fp, "0*%s ", emptylhsname); |
|
194 } |
|
195 } |
|
196 |
|
197 for(i=1;i<=k;i++) |
|
198 { |
|
199 if(val[i] != 0.0) |
|
200 { |
|
201 |
|
202 if(normalized) |
|
203 { |
|
204 fprintf(fp, "%d x%d ", |
|
205 (row_type==GLP_UP)?(-(int)val[i]):((int)val[i]), ndx[i]); |
|
206 } |
|
207 else |
|
208 { |
|
209 fprintf(fp, "%d*%s ", (int)val[i], |
|
210 glp_get_col_name(lp,ndx[i])); |
|
211 } |
|
212 } |
|
213 } |
|
214 switch(row_type) |
|
215 { |
|
216 case GLP_LO: |
|
217 { |
|
218 fprintf(fp, ">="); |
|
219 bound = glp_get_row_lb(lp,j); |
|
220 break; |
|
221 } |
|
222 case GLP_UP: |
|
223 { |
|
224 if(normalized) |
|
225 { |
|
226 fprintf(fp, ">="); |
|
227 bound = -glp_get_row_ub(lp,j); |
|
228 } |
|
229 else |
|
230 { |
|
231 fprintf(fp, "<="); |
|
232 bound = glp_get_row_ub(lp,j); |
|
233 } |
|
234 |
|
235 break; |
|
236 } |
|
237 case GLP_FX: |
|
238 { |
|
239 fprintf(fp, "="); |
|
240 bound = glp_get_row_lb(lp,j); |
|
241 break; |
|
242 } |
|
243 } |
|
244 fprintf(fp," %d;\n",(int)bound); |
|
245 } |
|
246 } |
|
247 } |
|
248 xfree(ndx); |
|
249 xfree(val); |
|
250 |
|
251 if(constant) |
|
252 { |
|
253 xprintf( |
|
254 "lpx_write_pb: adding constant objective function variable\n"); |
|
255 |
|
256 if(normalized) |
|
257 fprintf(fp, "1 x%d = 1;\n", n+1); |
|
258 else |
|
259 fprintf(fp, "1*%s = 1;\n", objconstname); |
|
260 } |
|
261 if(emptylhs) |
|
262 { |
|
263 xprintf( |
|
264 "lpx_write_pb: adding dummy variable for empty left-hand si" |
|
265 "de constraint\n"); |
|
266 |
|
267 if(normalized) |
|
268 fprintf(fp, "1 x%d = 0;\n", n+2); |
|
269 else |
|
270 fprintf(fp, "1*%s = 0;\n", emptylhsname); |
|
271 } |
|
272 |
|
273 } |
|
274 else |
|
275 { |
|
276 xprintf("Problems opening file for writing: %s\n", fname); |
|
277 return(1); |
|
278 } |
|
279 fflush(fp); |
|
280 if (ferror(fp)) |
|
281 { xprintf("lpx_write_pb: can't write to `%s' - %s\n", fname, |
|
282 strerror(errno)); |
|
283 goto fail; |
|
284 } |
|
285 fclose(fp); |
|
286 |
|
287 |
|
288 if(binarize) |
|
289 { |
|
290 /* delete the resultant problem object */ |
|
291 if (lp != NULL) lpx_delete_prob(lp); |
|
292 /* delete MIP presolver workspace */ |
|
293 if (ipp != NULL) ipp_delete_wksp(ipp); |
|
294 /*lp=tlp;*/ |
|
295 } |
|
296 return 0; |
|
297 fail: if (fp != NULL) fclose(fp); |
|
298 return 1; |
|
299 } |
|
300 #endif |
|
301 |
|
302 /* eof */ |