[9] | 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, 2011 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 */ |
---|