[Coin-discuss] osicplex strange behavior, writeMps bugs.

[Vivian.DeSmedt at aisystems.be]

Dear Osi,


This mail to report some problems.

first:

In attachemnent you will find a very small test suite.

(See attached file: main.zip)

It pass well for Cpl and Glpk but the last problem fail for Cplex.
If you look at the differences between problem 3 and problem 4 you will
notice that I add just an upper bound to the variable wich shouldn't modify
the answer.

This look like a problem in the cplex osi interface.


second:

It seems to me that there is a bug in the writeMps methode of Cpl and Glpk.
Both forget to take into account the type of problems (minization or
maximization) I guess both suppose minimization.

To prove that I generate problem for minimization and maximization and
nothing change.

This is after all my test just a bug report.
Tell me what you thing about it.

Vivian.
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