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[Bug-glpk] [Fwd: Re: [Fwd: preprocessing goes into infinite loop]]
From: |
Andrew Makhorin |
Subject: |
[Bug-glpk] [Fwd: Re: [Fwd: preprocessing goes into infinite loop]] |
Date: |
Sat, 14 Jan 2012 21:35:35 +0300 |
-------- Forwarded Message --------
From: John Perry <address@hidden>
To: Andrew Makhorin <address@hidden>
Cc: glpk xypron <address@hidden>, address@hidden
<address@hidden>, Nathann Cohen <address@hidden>
Subject: Re: [Bug-glpk] [Fwd: preprocessing goes into infinite loop]
Date: Sat, 14 Jan 2012 10:59:54 -0600
Andrew and Xypron
Thank you for the quick replies. I have three questions.
1) If I set the upper bound to DBL_MAX, I encounter the problem. Am I supposed
to set an upper bound of infinity differently?
2) If not, are you saying that GLPK cannot solve this kind of unbounded integer
problem in general?
3) Since glp_simplex discovers that there is no solution without crashing,
would it be advisable to solve by invoking glp_simplex first, then invoking
glp_intopt only if continuous solutions exist? or is this horribly inefficient?
regards
john perry
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