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/* allfaces.c: Test program to call the cdd library cddlib
written by Komei Fukuda, fukuda@ifor.math.ethz.ch
Version 0.94, August 4, 2005
Standard ftp site: ftp.ifor.math.ethz.ch, Directory: pub/fukuda/cdd
*/
/* This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "setoper.h"
#include "cdd.h"
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
#include <string.h>
dd_boolean SetInputFile(FILE **f, dd_DataFileType fname)
{
dd_boolean success=dd_FALSE;
success=dd_FALSE;
if ( ( *f = fopen(fname, "r") )!= NULL) {
printf("input file %s is open\n", fname);
success=dd_TRUE;
}
else{
printf("The input file %s not found\n",fname);
}
return success;
}
dd_boolean SetWriteFile(FILE **f, dd_DataFileType fname)
{
dd_boolean success=dd_FALSE;
if ( (*f = fopen(fname, "w")) != NULL){
printf("output file %s is open\n",fname);
success=dd_TRUE;
}
else{
printf("The output file %s cannot be opened\n",fname);
}
return success;
}
dd_boolean FaceEnum(dd_MatrixPtr M, dd_rowset R, dd_rowset S, dd_boolean rip, dd_colrange mindim)
{
dd_ErrorType err;
dd_rowset LL, ImL, RR, SS, Lbasis;
dd_rowrange i,iprev=0;
dd_colrange j,dim;
dd_LPSolutionPtr lps=NULL;
dd_boolean success=dd_FALSE;
set_initialize(&LL, M->rowsize);
set_initialize(&RR, M->rowsize);
set_initialize(&SS, M->rowsize);
set_copy(LL, M->linset); /* rememer the linset. */
set_copy(RR, R); /* copy of R. */
set_copy(SS, S); /* copy of S. */
if (dd_ExistsRestrictedFace(M, R, S, &err)){
set_uni(M->linset, M->linset, R);
dd_FindRelativeInterior(M, &ImL, &Lbasis, &lps, &err);
dim=M->colsize - set_card(Lbasis)-1;
set_uni(M->linset, M->linset, ImL);
fprintf(stdout,"%ld: ", dim); set_fwrite(stdout,M->linset);
if (rip){
/* Write an interior point. */
printf("RIP: (");
for (j=1; j <(lps->d)-1; j++) {
dd_WriteNumber(stdout,lps->sol[j]);
}
printf(")\n");
}
dd_FreeLPSolution(lps);
set_free(ImL);
set_free(Lbasis);
if (dim>mindim){
for (i=1; i<=M->rowsize; i++){
if (!set_member(i, M->linset) && !set_member(i, S)){
set_addelem(RR, i);
if (iprev) {
set_delelem(RR,iprev);
set_delelem(M->linset,iprev);
set_addelem(SS, iprev);
}
iprev=i;
FaceEnum(M, RR, SS, rip, mindim);
}
}
}
} else if (err!=dd_NoError) goto _L99;
success=dd_TRUE;
_L99:
set_copy(M->linset, LL); /* restore the linset */
set_free(LL);
set_free(RR);
set_free(SS);
return success;
}
int main(int argc, char *argv[])
{
dd_MatrixPtr M=NULL;
dd_rowrange m;
dd_ErrorType err=dd_NoError;
dd_rowset R, S;
dd_DataFileType inputfile;
FILE *reading=NULL;
char ch;
dd_colrange mindim;
dd_boolean rip=dd_FALSE;
dd_set_global_constants(); /* First, this must be called. */
if (argc>1) strcpy(inputfile,argv[1]);
if (argc<=1 || !SetInputFile(&reading,argv[1])){
dd_WriteProgramDescription(stdout);
fprintf(stdout,"\ncddlib test program to list all faces of an H-polyhedron.\n");
dd_SetInputFile(&reading,inputfile, &err);
}
if (err==dd_NoError) {
M=dd_PolyFile2Matrix(reading, &err);
}
else {
fprintf(stderr,"Input file not found\n");
goto _L99;
}
if (err!=dd_NoError) goto _L99;
if (M->representation==dd_Generator){
printf("The input is V-representation. Consider it as H-representation (N)? ");
ch=getchar(); getchar();
if (ch!='y' && ch!='Y') goto _L99;
}
m=M->rowsize;
set_initialize(&R, M->rowsize);
set_initialize(&S, M->rowsize);
printf("Output relative interior points (N)? ");
ch=getchar();
if (ch=='y' || ch=='Y') rip=dd_TRUE;
printf("Minimum dimension of faces to list (0..%ld) ? ",M->colsize-1);
scanf("%ld", &mindim);
if (mindim>=M->colsize) mindim=M->colsize-1;
printf("Minimum dimension is set to %ld.", mindim);
printf("\n--- FaceEnum (dim: active set) ---\nbegin\n");
FaceEnum(M, R, S, rip, mindim);
fprintf(stderr,"end\nFaceEnum completed.\n");
dd_FreeMatrix(M);
set_free(R);
set_free(S);
_L99:;
if (err!=dd_NoError) dd_WriteErrorMessages(stderr,err);
dd_free_global_constants(); /* At the end, this should be called. */
return 0;
}
/* end of allfaces.c */
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