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[Help-glpk] numerical instability
From: |
Andrew Walbran |
Subject: |
[Help-glpk] numerical instability |
Date: |
Sat, 4 Feb 2006 18:09:05 +1300 |
User-agent: |
KMail/1.8.3 |
Hi
I am working on building an LP model of an electricity market. I had a model
that ran in about 20 seconds. After changing some of the input data, I ran it
again, and this time GLPK kept giving the message:
'spx_simplex: numerical instability (primal simplex, phase II)'
and took much longer to run.
What does this message mean, and is there anything I can do about it to make
my model run faster?
I am using GLPK 4.8. A copy of some of the output from GLPK is attached.
--
Andrew Walbran
website: http://user.interface.org.nz/~andrew/
blog: http://qwandor.wordpress.com/
GLPK_output.txt
Description: Text document
pgp_sWhqBDvNv.pgp
Description: PGP signature
- [Help-glpk] numerical instability,
Andrew Walbran <=