-------- Forwarded Message -------- From: Andrew J. Lewis <[email protected]> Reply-to: "Andrew J. Lewis" <[email protected]> To: [email protected] Subject: Octave glpk() possible bug Date: Mon, 3 Jun 2013 06:40:59 +0100
Hi! 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 Preprocessing... 100 rows, 100 columns, 1058 non-zeros Scaling... 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) PROBLEM HAS NO FEASIBLE SOLUTION glp_simplex: unable to recover undefined or non-optimal solution status = 213 countcir = 0 opt_positions = [](0x0) octave-3.2.4.exe:3> 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 www.simulsystemsltd.co.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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