Re: [Bug-glpk] Bug in handling RANGES section in mps file

[Andrew Makhorin]

Chris,

> glpk is saying that cont1 found in
> http://plato.asu.edu/ftp/lptestset/misc/ has no primal feasible
> solution, while other solvers can solve it. I managed to trace it to
> an error in the handling of the RANGES statement in mps files, fixed
> by the attached patch.

Fixed. Thank you very much for your bug report and patch.

> 
> After this fix the solver starts but fails due to singular basis
> matrix, but this is another issue.
> 

This happens due to the initial basis routine which constructs a bad
initial basis.


Best regards,

Andrew Makhorin