int QSchange_coef (QSprob p, int rowindex, int colindex, double coef)
/* Change the matrix coefficient in row 1, col 2, to 1.5 */ int rval = 0; rval = QSchange_coef (p, 1, 2, 1.5); if (rval) { fprintf (stderr, "could not change coef, error code %d\n", rval); }