Probably a scaling issue. These numbers should scare the heck out of you: 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 ---------------------------------------------------------------- Erwin Kalvelagen Amsterdam Optimization Modeling Group er...@amsterdamoptimization.com http://amsterdamoptimization.com ---------------------------------------------------------------- On Tue, Apr 21, 2015 at 6:32 AM, Uday Reddy <udayre...@gmail.com> wrote: > 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. > > _______________________________________________ > Help-glpk mailing list > Help-glpk@gnu.org > https://lists.gnu.org/mailman/listinfo/help-glpk > >
_______________________________________________ Help-glpk mailing list Help-glpk@gnu.org https://lists.gnu.org/mailman/listinfo/help-glpk
