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 */ |
---|