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Re: [Help-glpk] Error:unable to factorize basis matrix
From: |
Yingjie Lan |
Subject: |
Re: [Help-glpk] Error:unable to factorize basis matrix |
Date: |
Wed, 11 Nov 2009 11:08:02 -0800 (PST) |
Hi Alex,
All I can say given the information you provided is that this seems to be a
problem with the GLPK solver, not the pymathprog, because the model is already
committed to the GLPK solver. Exactly why this message pops out from GLPK I
don't know for sure.
Yingjie
--- On Wed, 10/28/09, Alexander Schnell <address@hidden> wrote:
> From: Alexander Schnell <address@hidden>
> Subject: [Help-glpk] Error:unable to factorize basis matrix
> To: address@hidden
> Date: Wednesday, October 28, 2009, 3:22 PM
> Hello,
>
> i`m using pymathprog 0.3 and when trying to solve a big
> Binary Integer Program, i get the following error message
> and the evaluation stops:
>
> : obj = 2.719712443e+007 infeas = 9.756e+001
> (1409)
> 80200: obj = 2.719712443e+007 infeas =
> 9.756e+001 (1409)
> 80400: obj = 2.719712443e+007 infeas =
> 9.756e+001 (1409)
> 80600: obj = 2.719712443e+007 infeas =
> 9.756e+001 (1409)
> 80800: obj = 2.719712443e+007 infeas =
> 9.756e+001 (1400)
> 81000: obj = 2.723652533e+007 infeas =
> 8.235e+001 (1376)
> 81200: obj = 2.723652533e+007 infeas =
> 8.235e+001 (1369)
> Warning: numerical instability (primal simplex, phase I)
> 81259: obj = 2.723652533e+007 infeas =
> 8.235e+001 (1368)
> Warning: numerical instability (primal simplex, phase I)
> 81299: obj = 2.723652533e+007 infeas =
> 8.235e+001 (1368)
> 81400: obj = 2.723810723e+007 infeas =
> 7.967e+001 (1361)
> Error: unable to factorize the basis matrix (1)
> Sorry, basis recovery procedure not implemented yet
> ios_driver: unable to solve current LP relaxation;
> glp_simplex returned 5
> + 81411: mip = not found yet
> >= 2.618187908e+007
> (341; 1)
> glp_intopt: cannot solve current LP relaxation
>
> What does this mean? Has it something to do with the
> numerical instability warning?
>
> Best Regards,
> Alex
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