Re: [Bug-glpk] Error delete column

[Andrew Makhorin]

> otherwise, I have an other problem:

> GLPK display this message : 

> glp_simplex: initial basis is singular

> and it don't solve the LP

> What is the problem?

That means that the basis matrix, i.e. a square matrix built from
columns of the constraint matrix corresponding to basic variables, is
singular, so the current basis defined by statuses of rows and columns
is invalid in the sense that it does not define any basic solution.