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[Bug-glpk] [Fwd: Octave glpk() possible bug]

From: Andrew Makhorin
Subject: [Bug-glpk] [Fwd: Octave glpk() possible bug]
Date: Mon, 03 Jun 2013 09:47:42 +0400

-------- Forwarded Message --------
From: Andrew J. Lewis <address@hidden>
Reply-to: "Andrew J. Lewis" <address@hidden>
To: address@hidden
Subject: Octave glpk() possible bug
Date: Mon, 3 Jun 2013 06:40:59 +0100

I have successfully run our program in Matlab, but when I ported it
substituting glpk() for bintprog() the program only returns an answer
for low numbers of input values, which is insufficient.
I can make Octave work for <=5 input values, but when I try and run the
amended program with the settings which I ran on Matlab, I get the
following output:

octave-3.2.4.exe:2> OctaveBeeswax
GLPK Simplex Optimizer, v4.42
100 rows, 100 columns, 1058 non-zeros
100 rows, 100 columns, 1058 non-zeros
A: min|aij| = 1.000e+000 max|aij| = 1.000e+000 ratio = 1.000e+000
Problem data seem to be well scaled
Constructing initial basis...
Size of triangular part = 38
0: obj = 1.200000000e+001 infeas = 1.800e+001 (62)
26: obj = 1.200000000e+001 infeas = 1.800e+001 (40)
glp_simplex: unable to recover undefined or non-optimal solution
status = 213
countcir = 0
opt_positions = [](0x0)
I would be very grateful, please, for your opinions as to why repeatedly
Octave fails to find solutions when Matlab does? I have tried every
combination, including generating test data in Excel.
Best regards,
Andrew J. Lewis MSc, FLS, MRI
Simul Systems Ltd
Chelmsford, Essex, UK
M:+44 (0)7710 588318
F:+44 (0)705 361 1341
A member of Chelmsford Innovation Group - a "Smart Swarm" business
self-help group

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