Anton, > There are ten inputs originally collected for GLPK 4.55. > Three of them do not confuse GLPK since 4.56, at least for one > hour horizon. Another two invariably force the solver to fail. > > >From 4.55, 4.56 to 4.59, 4.59.2, the set of errors has changed. > Now it includes, besides locking in dual simplex, > Assertion failed: tcol[csa->p] != 0.0 > Error detected in file ..\src\simplex\spydual.c at line ... > and > glp_intopt: cannot solve current LP relaxation. >
Thank you very much for your evaluation of glpk. Your models have some unusual numerical properties that helps me to reveal some rare cases in the simplex algorithms. I added another feature to the glpk dual simplex solver, which is the perturbation of objective coefficients used to avoid numerical instability and cycling. I will inform you about a new release of glpk. Best regards, Andrew Makhorin _______________________________________________ Bug-glpk mailing list [email protected] https://lists.gnu.org/mailman/listinfo/bug-glpk
