[Help-glpk] column index inconsistency

[Somsubhra Sharangi]

Hi,

When I try to set and get the columns of a row the columns index changes.
In the attached code i am adding a row with 4 columns and then retrieving the same.
For the code attached below, the output looks like :

3.0*x1 5.0*x2 7.0*x3 9.0*x4 
9.0*x4 7.0*x3 5.0*x2 3.0*x1

While the <index, coeff> pairs are same the contents of the input and output array has changed.
I am assuming such a basic thing is probably not a bug. 
What is the proper way to use the API so that my set and get arrays contain the same value.


regards,
Som
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    int N = 4;
    glp_prob *primal=glp_create_prob();
    glp_add_cols(primal,N);
    double row_cf[] = {3.0,5.0,7.0,9.0};
    int set_indx[N+1],get_indx[N+1];
    double set_coef[N+1],get_coef[N+1];
    
    for(int i=0,j=1;i<N;i++,j++){
        set_indx[j]=j;
        set_coef[j] = row_cf[i];
    }

    for(int c=1;c<=N;c++)
        printf("%3.1f*x%d ",set_coef[c],set_indx[c]);    
    printf("\n");

    int next_row=glp_add_rows(primal,1);
    glp_set_mat_row(primal, next_row, N, set_indx, set_coef);

    glp_get_mat_row(primal, next_row, get_indx, get_coef);
    
    for(int c=1;c<=N;c++)
        printf("%3.1f*x%d ",get_coef[c],get_indx[c]);
    printf("\n");
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