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Re: [Help-glpk] glpk fails with error: unable to factorize basis matrix
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From: |
Nigel Galloway |
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Subject: |
Re: [Help-glpk] glpk fails with error: unable to factorize basis matrix ( |
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Date: |
Wed, 22 Apr 2015 06:21:02 -0700 |
see http://yetanothermathprogrammingconsultant.blogspot.co.uk/
--
Nigel Galloway
address@hidden
On Tue, Apr 21, 2015, at 03:32 AM, Uday Reddy wrote:
> With glpk 4.52 and with the attached input, I get the following
> failure/error:
>
> ------------------------------------------------------------------------------
> $ glpsol --lp mi.cplex
>
> Warning: numerical instability (primal simplex, phase I)
> 2979: obj = 1.092652474e+04 infeas = 5.265e+09 (0)
> Warning: numerical instability (primal simplex, phase I)
> 2996: obj = 1.092637382e+04 infeas = 5.260e+09 (0)
> 3000: obj = 1.092644011e+04 infeas = 5.235e+09 (0)
> Warning: numerical instability (primal simplex, phase I)
> 3051: obj = 1.077725595e+04 infeas = 5.201e+09 (0)
> Warning: numerical instability (primal simplex, phase I)
> 3059: obj = 1.074805814e+04 infeas = 5.185e+09 (0)
> Warning: numerical instability (primal simplex, phase I)
> 3122: obj = 1.998434476e+03 infeas = 3.955e+05 (0)
> Warning: numerical instability (primal simplex, phase I)
> 3159: obj = 1.998431624e+03 infeas = 3.944e+05 (0)
> Error: unable to factorize the basis matrix (1)
> Sorry, basis recovery procedure not implemented yet
> glp_intopt: cannot solve LP relaxation
> Time used: 1.7 secs
> Memory used: 10.8 Mb (11322915 bytes)
> --------------------------------------------------------------
>
> Any insights/workarounds will be appreciated.
> _______________________________________________
> Help-glpk mailing list
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> https://lists.gnu.org/mailman/listinfo/help-glpk
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> + mi.cplex.gz
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