> I changed the code and all the variables now have fixed upper bound > ( 1000 units). But I am still getting the Numerical instability > warnings.
Numerical instability may happen because of badly scaled problems, so try to scale your initial lp instance with glp_scale_prob (do not use glp_scale_prob before reoptimization). Please note that the message about numerical instability is a warning; if glp_simplex solves to the end, you may ignore that message. > In my program, the size of the model increases in each solve. Is the > instability because of the increasing problem size or accumulated > round-off errors. If latter is the case, is there any way to determine > the instability and reset the model when instability is present. > In the simplex method round-off errors are not accumulated. However, almost linearly dependent rows added to the current formulation may cause numerical instability. _______________________________________________ Help-glpk mailing list [email protected] https://lists.gnu.org/mailman/listinfo/help-glpk
