[Coin-discuss] Bugs in OsiGlpk

[Brady Hunsaker]

Thanks for the feedback, Tim.

I'll take a look at these bugs this weekend.  I've been meaning to
check on how OsiGlpk is doing, anyway.

Also, FLOPC++ looks very promising.  I meant to try it out last week,
but just have been pressed for time.  I'll send feedback once I've
tried a few models.

Brady

On Thu, Mar 27, 2003 at 12:45:35PM +0000, Tim Hultberg wrote:

> I have encountered what seems to be 2 bugs in OsiGlpk:
> 
> 1.
> When using OsiOsl both alternatives below work fine.
> a.
>     CoinPackedMatrix A(true,m,n,Cst[n],Elm,Rnr,Cst,Clg);
>     Solver->loadProblem(A, l, u, c, bl, bu);
> b.
>     Solver->loadProblem(n, m, Cst, Rnr, Elm, l, u, c, bl, 
> bu);
> 
> When using OsiGlpk, only a. works.
> 
> 2.
> When using OsiGlpk for MIP, the solution which is reported 
> is the solution of the LP-relaxation (although the correct 
> problem is being solved!).
> 
> Tim Hultberg
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----------------
Brady Hunsaker
Georgia Institute of Technology
Program in Algorithms, Combinatorics, and Optimization
School of Industrial and Systems Engineering

E-mail address:   hunsaker at isye.gatech.edu