/*******************************************************
Mosel User Guide Example Problems
=================================
file ugxprs1.c
``````````````
Passing from Mosel to solving with Xpress Optimizer.
Running the BIM file.
(c) 2008 Fair Isaac Corporation
author: S. Heipcke, 2001, rev. Nov. 2010
********************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "xprm_rt.h"
#include "xprs.h"
#ifdef _WIN64
#define strtoadr _strtoui64
#else
#define strtoadr strtoul
#endif
int main()
{
XPRMmodel mod;
XPRMdsolib dso;
XPRMalltypes rvalue;
XPRSprob prob;
int result, ncol, len, i;
double *sol, val;
char *names, *onecol;
if(XPRMinit()) /* Initialize Mosel */
return 1;
if((mod=XPRMloadmod("burglar4.bim",NULL))==NULL) /* Load a BIM file */
return 2;
if(XPRMrunmod(mod,&result,NULL)) /* Run the model (no optimization) */
return 3;
/* Retrieve the pointer to the problem loaded in the Xpress Optimizer */
if((dso=XPRMfinddso("mmxprs"))==NULL)
return 4;
if(XPRMgetdsoparam(mod, dso, "xprs_problem", &result, &rvalue))
return 5;
prob=(XPRSprob)strtoadr(rvalue.ref,NULL,0);
XPRSchgobjsense(prob, XPRS_OBJ_MAXIMIZE); /* Set sense to maximization */
if(XPRSmipoptimize(prob, "")) /* Solve the problem */
return 6;
if(XPRSgetintattrib(prob, XPRS_MIPSTATUS, &result))
return 7; /* Test whether a solution is found */
if((result==XPRS_MIP_SOLUTION) || (result==XPRS_MIP_OPTIMAL))
{
if(XPRSgetdblattrib(prob, XPRS_MIPOBJVAL, &val))
return 8;
printf("Objective value: %g\n", val); /* Print the objective function value */
if(XPRSgetintattrib(prob, XPRS_ORIGINALCOLS, &ncol))
return 9;
if((sol = (double *)malloc(ncol * sizeof(double)))==NULL)
return 10;
if(XPRSgetmipsol(prob, sol, NULL))
return 11; /* Get the primal solution values */
if(XPRSgetnamelist(prob, 2, NULL, 0, &len, 0, ncol-1))
return 11; /* Get the name array length */
if((names = (char *)malloc(len*sizeof(char)))==NULL)
return 12;
if(XPRSgetnamelist(prob, 2, names, len, NULL, 0, ncol-1))
return 13; /* Get the variable names */
onecol = names;
for(i=0; i<ncol; i++) { /* Print out the solution */
printf("%s: %g\n", onecol, sol[i]);
onecol = onecol+strlen(onecol)+1;
}
free(names);
free(sol);
}
return 0;
}
|
/*******************************************************
Mosel User Guide Example Problems
=================================
file ugxprs2.c
``````````````
Passing from Mosel to solving with Xpress Optimizer.
Executing a model file.
(c) 2008 Fair Isaac Corporation
author: S. Heipcke, 2002, rev. Nov. 2010
********************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "xprm_mc.h"
#include "xprs.h"
#ifdef _WIN64
#define strtoadr _strtoui64
#else
#define strtoadr strtoul
#endif
int main()
{
XPRMmodel mod;
XPRMdsolib dso;
XPRMalltypes rvalue;
XPRSprob prob;
int result, ncol, len, i;
double *sol, val;
char *names, *onecol;
if(XPRMinit()) /* Initialize Mosel */
return 1;
if(XPRMexecmod(NULL,"burglar4.mos",NULL,&result,&mod))
return 2; /* Execute a model file */
/* Retrieve the pointer to the problem loaded in the Xpress Optimizer */
if((dso=XPRMfinddso("mmxprs"))==NULL)
return 4;
if(XPRMgetdsoparam(mod, dso, "xprs_problem", &result, &rvalue))
return 5;
prob=(XPRSprob)strtoadr(rvalue.ref,NULL,0);
XPRSchgobjsense(prob, XPRS_OBJ_MAXIMIZE); /* Set sense to maximization */
if(XPRSmipoptimize(prob, "")) /* Solve the problem */
return 6;
if(XPRSgetintattrib(prob, XPRS_MIPSTATUS, &result))
return 7; /* Test whether a solution is found */
if((result==XPRS_MIP_SOLUTION) || (result==XPRS_MIP_OPTIMAL))
{
if(XPRSgetdblattrib(prob, XPRS_MIPOBJVAL, &val))
return 8;
printf("Objective value: %g\n", val); /* Print the objective function value */
if(XPRSgetintattrib(prob, XPRS_ORIGINALCOLS, &ncol))
return 9;
if((sol = (double *)malloc(ncol * sizeof(double)))==NULL)
return 10;
if(XPRSgetmipsol(prob, sol, NULL))
return 11; /* Get the primal solution values */
if(XPRSgetnamelist(prob, 2, NULL, 0, &len, 0, ncol-1))
return 11; /* Get the name array length */
if((names = (char *)malloc(len*sizeof(char)))==NULL)
return 12;
if(XPRSgetnamelist(prob, 2, names, len, NULL, 0, ncol-1))
return 13; /* Get the variable names */
onecol = names;
for(i=0; i<ncol; i++) { /* Print out the solution */
printf("%s: %g\n", onecol, sol[i]);
onecol = onecol+strlen(onecol)+1;
}
free(names);
free(sol);
}
return 0;
}
|
(!******************************************************
Mosel User Guide Example Problems
=================================
file burglar4.mos
`````````````````
Same as burglar3.mos but no optimization.
(c) 2008 Fair Isaac Corporation
author: S. Heipcke, 2001, rev. June 2018
*******************************************************!)
model Burglar4
uses "mmxprs"
public declarations
WTMAX = 102 ! Maximum weight allowed
ITEMS = {"camera", "necklace", "vase", "picture", "tv", "video",
"chest", "brick"} ! Index set for items
VALUE: array(ITEMS) of real ! Value of items
WEIGHT: array(ITEMS) of real ! Weight of items
take: array(ITEMS) of mpvar ! 1 if we take item i; 0 otherwise
end-declarations
initializations from 'burglar.dat'
VALUE WEIGHT
end-initializations
! Objective: maximize total value
MaxVal:= sum(i in ITEMS) VALUE(i)*take(i)
! Weight restriction
sum(i in ITEMS) WEIGHT(i)*take(i) <= WTMAX
! All variables are 0/1
forall(i in ITEMS) take(i) is_binary
setparam("XPRS_LOADNAMES", true) ! Enable loading of object names
loadprob(MaxVal)
end-model
|
