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[Octave-bug-tracker] [bug #30460] call to GLPK hangs

From: anonymous
Subject: [Octave-bug-tracker] [bug #30460] call to GLPK hangs
Date: Fri, 16 Jul 2010 10:00:16 +0000
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_5_7; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.70 Safari/533.4


                 Summary: call to GLPK hangs
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Fri 16 Jul 2010 10:00:11 AM UTC
                Category: Libraries
                Severity: 3 - Normal
              Item Group: Crash
                  Status: None
             Assigned to: None
         Originator Name: Mahesh Sivasambu
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.2.3
        Operating System: Mac OS



The following sequence of calls to glpk to solve a small (8x48)  linear
programming problem hangs: 

epun:/tmp> octave
octave-3.2.3:1> global A b c
octave-3.2.3:2> load "Abc.out"; # file Abc.out is attached.
octave-3.2.3:3> [y, fmin, status, extra] = glpk( c, A, b )
(no output) 

I am using GNU Octave, version 3.2.3, (binary file downloaded from 

The present bug is very sensitive to the matrices A, b and c's values. If I
were to store the variables in ascii format (instead of binary) the bug
vanishes. I am guessing this is because of truncation. 

This may be a GLPK bug and not an octave bug after all. If so, how can I

Many thanks,


File Attachments:

Date: Fri 16 Jul 2010 10:00:12 AM UTC  Name: Abc.out  Size: 4kB   By: None



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