Hello Andrew, currently
glp_set_mat_col() glp_set_mat_row() glp_load_matrix() may be used to place zero valued coefficients in the sparse matrix stored as structure GLPAIJ. These zero values are not needed in any way by GLPK. It is left to the calling problem to avoid passing zeros. I suggest to change above functions to check the value of coefficients and to simply ignore any zero values. A simple if (0 == val[k]) continue; will be sufficient. Best regards Heinrich Schuchardt
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