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| From: | Erwin Kalvelagen |
| Subject: | Re: [Help-glpk] glpk fails with error: unable to factorize basis matrix ( |
| Date: | Tue, 21 Apr 2015 12:16:30 -0400 |
Scaling...
A: min|aij| = 1.000e+00 max|aij| = 2.306e+18 ratio = 2.306e+18
GM: min|aij| = 1.213e-04 max|aij| = 8.246e+03 ratio = 6.800e+07
EQ: min|aij| = 1.480e-08 max|aij| = 1.000e+00 ratio = 6.755e+07
2N: min|aij| = 1.490e-08 max|aij| = 1.500e+00 ratio = 1.007e+08
With glpk 4.52 and with the attached input, I get the following failure/error:
------------------------------------------------------------------------------
$ glpsol --lp mi.cplex
Warning: numerical instability (primal simplex, phase I)
2979: obj = 1.092652474e+04 infeas = 5.265e+09 (0)
Warning: numerical instability (primal simplex, phase I)
2996: obj = 1.092637382e+04 infeas = 5.260e+09 (0)
3000: obj = 1.092644011e+04 infeas = 5.235e+09 (0)
Warning: numerical instability (primal simplex, phase I)
3051: obj = 1.077725595e+04 infeas = 5.201e+09 (0)
Warning: numerical instability (primal simplex, phase I)
3059: obj = 1.074805814e+04 infeas = 5.185e+09 (0)
Warning: numerical instability (primal simplex, phase I)
3122: obj = 1.998434476e+03 infeas = 3.955e+05 (0)
Warning: numerical instability (primal simplex, phase I)
3159: obj = 1.998431624e+03 infeas = 3.944e+05 (0)
Error: unable to factorize the basis matrix (1)
Sorry, basis recovery procedure not implemented yet
glp_intopt: cannot solve LP relaxation
Time used: 1.7 secs
Memory used: 10.8 Mb (11322915 bytes)
--------------------------------------------------------------
Any insights/workarounds will be appreciated.
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