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Re: [Bug-glpk] Sensitivity Information not presented in sensitivity boun
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From: |
Andrew Makhorin |
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Subject: |
Re: [Bug-glpk] Sensitivity Information not presented in sensitivity bounds file |
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Date: |
Tue, 20 Oct 2009 13:29:33 +0400 |
Hi Xypron,
> the problem below can be solved by the dual simplex
> glpsol.exe -m test.mod --dual
> Yet glp_get_dual_stat() returns
> GLP_INFEAS dual solution is infeasible
> for the problem when called in glplpx03.c.
> The dual values for the constraints are
> c1: 1.000000
> c2: 1.000000
> c3: -0.000000e+000
The bug is in glp_warm_up, which is called (via lpx_warm_up) from
glplpx03. It does not account optimization direction, so the dual
status is determined correctly only for minimization.