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// change_cost.cc
// This file provides an interface for changing the cost vector in IP-problems
// and for recomputing Groebner basis of toric ideals.
#ifndef CHANGE_COST_CC
#define CHANGE_COST_CC
#include "IP_algorithms.h"
int main(int argc, char *argv[])
{
// initialize arguments for the IP-algorithms (Buchberger)
// with default settings
BOOLEAN verbose=FALSE;
short version=1;
short S_pair_criteria=11;
double interreduction_percentage=12.0;
///////////////////////// parse options /////////////////////////////////////
if(argc>=3)
// argc has to be at least 3 (except when help is required, see below):
// program name, GROEBNER file, NEW_COST file
{
for(short i=1;i<argc-2;i++)
// these are the input options
{
if(!strcmp(argv[i],"-v") || !strcmp(argv[i],"--verbose"))
{
verbose=TRUE;
continue;
// read next argument
}
if(!strcmp(argv[i],"-V") || !strcmp(argv[i],"-version"))
{
// check if next argument is a valid version number
i++;
if(!strcmp(argv[i],"1"))
{
version=1;
continue;
}
if(!strcmp(argv[i],"1a"))
{
version=0;
continue;
}
if(!strcmp(argv[i],"2"))
{
version=2;
continue;
}
if(!strcmp(argv[i],"3"))
{
version=3;
continue;
}
// When reaching this line, the version argument was invalid.
cerr<<"ERROR: invalid version argument"<<endl
<<"Type `change_cost --help' for help on options."<<endl;
return 1;
}
if(!strcmp(argv[i],"-S"))
{
// initialize argument to the use of no criteria
S_pair_criteria=0;
do
{
// Check what S-pair criterion the next argument indicates.
// If none: The algorithm is called without S-pair criteria.
i++;
if(i>=argc-2)
// file arguments reached
break;
if(!strcmp(argv[i],"RP"))
{
S_pair_criteria|=1;
continue;
}
if(!strcmp(argv[i],"M"))
{
S_pair_criteria|=2;
continue;
}
if(!strcmp(argv[i],"F"))
{
S_pair_criteria|=4;
continue;
}
if(!strcmp(argv[i],"B"))
{
S_pair_criteria|=8;
continue;
}
if(!strcmp(argv[i],"2"))
{
S_pair_criteria|=16;
continue;
}
// option does not belong to an S-pair criterion
break;
}
while(1);
i--; // reset counter so that the outer loop
continue; // continues with the just considered argument
}
if(!strcmp(argv[i],"-p"))
{
// read interreduction percentage
i++;
char** rest;
interreduction_percentage=strtod(argv[i],rest);
// The function strtod converts a string into a double. As the
// specification is not correct, it may cause trouble...
// For example, if the argument can be read as a float, the value
// of rest should be NULL. This is not the case. Therefore, we can
// only check by the following string comparison if a float has been
// built. An argument as 15xy is thereby considered as valid
// (with interreduction_percentage==15.0).
if(!(strcmp(argv[i],*rest)))
// argument was no float
{
cerr<<"ERROR: invalid argument for interreduction percentage"<<endl
<<"Type `change_cost --help' for help on options."<<endl;
return 1;
}
continue;
}
// When reaching this line, the argument is no legal option.
cerr<<"ERROR: invalid option "<<argv[i]<<endl
<<"Type `change_cost --help' for help on options."<<endl;
return 1;
}
///////////////////// call IP-algorithms ////////////////////////////////////
// open first input stream (GROEBNER file)
ifstream first_input(argv[argc-2]);
if(!first_input)
{
cerr<<"ERROR: cannot open first input file, possibly not found"<<endl;
return 1;
}
// open second input stream (NEW_COST file)
ifstream second_input(argv[argc-1]);
if(!second_input)
{
cerr<<"ERROR: cannot open second input file, possibly not found"<<endl;
return 1;
}
// change term ordering
int success=change_cost(argv[argc-2], argv[argc-1], version,
S_pair_criteria, interreduction_percentage,
verbose);
if(!success)
{
cerr<<"ERROR: could not change cost vector,\n"
"no new GROEBNER file created"<<endl;
return 1;
}
// Groebner basis successfully changed
return 0;
}
/////////////////////// provide help text ///////////////////////////////////
// handle the case of "missing" arguments
if((argc==2) && !strcmp(argv[1],"--help"))
// help required
{
system("less change_cost.hlp");
return 0;
}
else
// invalid arguments
cerr<<"USAGE: change_cost [options] groebner_file new_cost_file"<<endl
<<"Type `change_cost --help' for help on options."<<endl;
return 1;
}
#endif // CHANGE_COST_CC
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