Re: [Help-glpk] Simplex error message

[Andrew Makhorin]

> using the simplex of  the glpk I got an error message which says: the basis
> matrix is singuar.  Can You tell me what is meant, because I think the basis
> matrix  is the unity and therefore not singular.

This means that the matrix built from columns (of the original
constraint matrix) corresponding to basic variables is singular.

By default the solver glpsol starts from an advanced basis whose
matrix is triangular, not unity. If you need the solver to start
from the unity matrix, use the option `--std'.