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From: | Frédéric Besson |
Subject: | [Bug-glpk] assertion failure glpspx02.c |
Date: | Tue, 8 Apr 2008 15:56:00 +0400 |
Hello, I think I have stumbled on a glpk bug (version 4.28). On a particular problem, I get an assertion failure: Assertion failed: spx->p != 0 Error detected in file glpspx02.c at line 602 Before getting the assertion failure, I get a numerical instability warning spx_simplex: warning: numerical instability (primal simplex, phase I) BTW, I get this message even when calling glp_simplex with GLP_DUALP. When I reverse the rows, I get PROBLEM HAS UNBOUNDED SOLUTION This happens when I call glp_simplex from another language. The funny thing is that when I write the problem into a file (cplex format), glpsol does not complain and finds an optimal value. I know this is not a very comprehensive bug report. Of course, I would be happy to give you more insights -- tell me if there are debug options that could be useful for you. I attach the cplex file and the output of lpx_print_prob:
file.133
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Part1.txt
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file.txt.133
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Part2.txt
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