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Re: [Bug-glpk] Assertion at glpipm.c; line 571

From: Barry Rountree
Subject: Re: [Bug-glpk] Assertion at glpipm.c; line 571
Date: Mon, 27 Mar 2006 19:55:48 +0400

On Mon March 27 2006 04:28, Andrew Makhorin wrote:
> > Assertion failed: x[j] > 0.0 && z[j] > 0.0; file glpipm.c; line 571

> Thank you for the bug report.
> Looks like the bug appears due to excessive round-off errors in the
> solution of the normal system, because the problem is badly scaled.
> Could you please gzip the problem data causing the bug in mps format
> and send it to me?

Eh, that was the hint I needed.  I hadn't used mps format before, so I decided 
to have a look at it before I sent it off to you.  It had lots of "Inf"s, 
which tends to happen when I divide by zero (funny, that).  I modified my 
data so that I'm dividing by a sufficiently small non-zero number and the 
interior-point method found the optimal solution as expected.

I'm appending the file in case you want to check for anything else that might 
be going on.  

Thanks for the help!  


> Andrew Makhorin

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