Calling a library
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  1. #1
    Join Date
    Dec 2012
    Posts
    21

    Calling a library

    I am new to c++, so I apologize for the possibly poorly formulated question below.

    I am trying to use gnu glpk library, and I am doing something wrong.

    I code in visual studio 2010. To use the library, I have included the #include <glpk.h> command. In the code I pass through it (visible below) I get 15 instances of
    1>lkj.obj : error LNK2019: unresolved external symbol _glp_create_prob referenced in function _main
    and similar.

    I am sure there is something silly I just don't know that I am supposed to do.

    Here is my code:

    Code:
    #include <iostream>
    #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;
    s1: lp = glp_create_prob();
    s2: glp_set_prob_name(lp, "sample");
    s3: glp_set_obj_dir(lp, GLP_MAX);
    s4: glp_add_rows(lp, 3);
    s5: glp_set_row_name(lp, 1, "p");
    s6: glp_set_row_bnds(lp, 1, GLP_UP, 0.0, 100.0);
    s7: glp_set_row_name(lp, 2, "q");
    s8: glp_set_row_bnds(lp, 2, GLP_UP, 0.0, 600.0);
    s9: glp_set_row_name(lp, 3, "r");
    s10: glp_set_row_bnds(lp, 3, GLP_UP, 0.0, 300.0);
    s11: glp_add_cols(lp, 3);
    s12: glp_set_col_name(lp, 1, "x1");
    s13: glp_set_col_bnds(lp, 1, GLP_LO, 0.0, 0.0);
    s14: glp_set_obj_coef(lp, 1, 10.0);
    s15: glp_set_col_name(lp, 2, "x2");
    s16: glp_set_col_bnds(lp, 2, GLP_LO, 0.0, 0.0);
    s17: glp_set_obj_coef(lp, 2, 6.0);
    s18: glp_set_col_name(lp, 3, "x3");
    s19: glp_set_col_bnds(lp, 3, GLP_LO, 0.0, 0.0);
    s20: glp_set_obj_coef(lp, 3, 4.0);
    s21: ia[1] = 1, ja[1] = 1, ar[1] = 1.0; /* a[1,1] = 1 */
    s22: ia[2] = 1, ja[2] = 2, ar[2] = 1.0; /* a[1,2] = 1 */
    s23: ia[3] = 1, ja[3] = 3, ar[3] = 1.0; /* a[1,3] = 1 */
    s24: ia[4] = 2, ja[4] = 1, ar[4] = 10.0; /* a[2,1] = 10 */
    s25: ia[5] = 3, ja[5] = 1, ar[5] = 2.0; /* a[3,1] = 2 */
    s26: ia[6] = 2, ja[6] = 2, ar[6] = 4.0; /* a[2,2] = 4 */
    s27: ia[7] = 3, ja[7] = 2, ar[7] = 2.0; /* a[3,2] = 2 */
    s28: ia[8] = 2, ja[8] = 3, ar[8] = 5.0; /* a[2,3] = 5 */
    s29: ia[9] = 3, ja[9] = 3, ar[9] = 6.0; /* a[3,3] = 6 */
    s30: glp_load_matrix(lp, 9, ia, ja, ar);
    s31: glp_simplex(lp, NULL);
    s32: z = glp_get_obj_val(lp);
    s33: x1 = glp_get_col_prim(lp, 1);
    s34: x2 = glp_get_col_prim(lp, 2);
    s35: x3 = glp_get_col_prim(lp, 3);
    s36: printf("\nz = %g; x1 = %g; x2 = %g; x3 = %g\n",
    z, x1, x2, x3);
    s37: glp_delete_prob(lp);
    return 0;
    }
    /* eof */
    I assume that I am forgetting to add a library in one way or another...

    Help would be much appreciated!
    Last edited by gugge444; December 7th, 2012 at 12:10 PM.

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