[Bug-glpk] [Fwd: Re: [Fwd: preprocessing goes into infinite loop]]

[Andrew Makhorin]

-------- 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