COINMP infeasable GLPK, CBC optimal solution

[Tom van der Hoeven]

Hello,

I have a small lp problem where COIN gives infeasible, while GLPK and
CBC give the same optimal solution.
The lp problem is balancing over 8 supplies and demand over 36 month
with some cost involved.
I have 2 questions.
1. Can I give COIN more options such that I can find out why COIN mark
the problem as infeasible.
2. Can I separate my problem out of PULP and run it with COINMP
directly, giving the same result and having more control.
Given the problem, I guess there is a kind of translation error.
I work in a VISTA environment.

Tom van der Hoeven

[Tom van der Hoeven]

[Stuart Mitchell]

Hmm this is interesting I know COINMP does not report Integer
infeasible solutions correctly.

Send me the problem (privately if you want and I'll look into it)

BTW I will probably make command line cbc the default solver in the
next version of pulp.

Stu

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Stuart Mitchell
PhD Engineering Science
Freelance Programmer and Optimisation Expert
www.stuartmitchell.com