Re: [Help-glpk] [Fwd: GLPK Implementation help]

[glpk xypron]

Hello João,

your mail had to be forwarded manually because you are not subscribed to the 
GLPK help list, cf.
https://lists.gnu.org/mailman/listinfo/help-glpk

Probably the library path is not correctly specified.
It worked for me as following on a 32bit Windows 7 system:

Download winglpk-4.47.1.zip from http://sourceforge.net/projects/winglpk/
Extract it and copy to c:\program files\glpk.
Copy glpk-4.47\w32\glpk_4_47.dll to C:\windows\system32.
Open Visual Studio Express 2010 C++.
Create new "Win32 Console Application"
Do not choose compiled headers.
Open project properties.
In "Linker->Additonal Dependencies" add
"c:\program files\glpk\glpk-4.47\w32\glpk_4_47.lib"
In "Configuration Properties->VC++ Directories add
c:\Program Files\GLPK\glpk-4.47\src
Enter the following code:

#include <stdio.h>
#include <conio.h>
#include "glpk.h"
int main(int argc, char* argv[])
{
        printf ("GLPK version %s\n", glp_version());
        printf ("Press any key\n");
        while (!kbhit()){}
        getch();
        return 0;
}

Press F5 to build and run.
On Windows 64bit adjust the pathes accordingly.

Best regards

Xypron

> -------- Forwarded Message --------
> Subject: GLPK Implementation help
> Date: Tue, 31 Jul 2012 11:57:28 +0100
> 
> hi,
> 
> 
> I am João Guedes, master student of University of Minho, in Portugal. 
> I'm developing a LP tool for my thesis, and dicide to use GLPK as my
> solver, however i  am having some issues in the implementation
> I'm using MS Visual Studio 2010, and in my project i include your lib,
> and add your glpk.h to my addicionals c++ lib, but when i compile the
> program i have a error on linker in all your funcions like this error
> LNK2001: unresolved external symbol _glp_add_cols
> Can you please help me?
> 
> 
> The exemple that i'm trying to use is this:
> 
> 
> #include <stdio.h>
> #include <stdlib.h>
> #include <glpk.h>
> 
> 
> int main(void)
> {     glp_prob *lp;
>       int ia[1+1000], ja[1+1000];
>       double ar[1+1000], z, x1, x2, x3;
> lp = glp_create_prob();
> glp_set_prob_name(lp, "sample");
> glp_set_obj_dir(lp, GLP_MAX);
> glp_add_rows(lp, 3);
> glp_set_row_name(lp, 1, "p");
> glp_set_row_bnds(lp, 1, GLP_UP, 0.0, 100.0);
> glp_set_row_name(lp, 2, "q");
> glp_set_row_bnds(lp, 2, GLP_UP, 0.0, 600.0);
> glp_set_row_name(lp, 3, "r");
> glp_set_row_bnds(lp, 3, GLP_UP, 0.0, 300.0);
> glp_add_cols(lp, 3);
> glp_set_col_name(lp, 1, "x1");
> glp_set_col_bnds(lp, 1, GLP_LO, 0.0, 0.0);
> glp_set_obj_coef(lp, 1, 10.0);
> glp_set_col_name(lp, 2, "x2");
> glp_set_col_bnds(lp, 2, GLP_LO, 0.0, 0.0);
> glp_set_obj_coef(lp, 2, 6.0);
> glp_set_col_name(lp, 3, "x3");
> glp_set_col_bnds(lp, 3, GLP_LO, 0.0, 0.0);
> glp_set_obj_coef(lp, 3, 4.0);
> ia[1] = 1, ja[1] = 1, ar[1] =  1.0; /* a[1,1] =  1 */
> ia[2] = 1, ja[2] = 2, ar[2] =  1.0; /* a[1,2] =  1 */
> ia[3] = 1, ja[3] = 3, ar[3] =  1.0; /* a[1,3] =  1 */
> ia[4] = 2, ja[4] = 1, ar[4] = 10.0; /* a[2,1] = 10 */
> ia[5] = 3, ja[5] = 1, ar[5] =  2.0; /* a[3,1] =  2 */
> ia[6] = 2, ja[6] = 2, ar[6] =  4.0; /* a[2,2] =  4 */
> ia[7] = 3, ja[7] = 2, ar[7] =  2.0; /* a[3,2] =  2 */
> ia[8] = 2, ja[8] = 3, ar[8] =  5.0; /* a[2,3] =  5 */
> ia[9] = 3, ja[9] = 3, ar[9] =  6.0; /* a[3,3] =  6 */
> glp_load_matrix(lp, 9, ia, ja, ar);
> glp_simplex(lp, NULL);
> z = glp_get_obj_val(lp);
> x1 = glp_get_col_prim(lp, 1);
>  x2 = glp_get_col_prim(lp, 2);
> x3 = glp_get_col_prim(lp, 3);
> printf("\nz = %g; x1 = %g; x2 = %g; x3 = %g\n",
>          z, x1, x2, x3);
> glp_delete_prob(lp);
>       return 0;
> }
> 
> 
> 
> 
> 
> -- 
> Cumprimentos
> João Guedes
> 
> 
> 
> 
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