Search found 4 matches

by moosavi_69
1 month ago
Forum: Solvers
Topic: CPU time for large-scale instances
Replies: 2
Views: 133

Re: CPU time for large-scale instances

Dear Steve, I am grateful for your prompt attention. Following to your question regarding the decision variables, I have to tell you that variables in this problem are positive integer or binary. To be more precise, around 15,000 of them are binary variables and 8,000 of them are positive integer va...
by moosavi_69
1 month ago
Forum: Solvers
Topic: CPU time for large-scale instances
Replies: 2
Views: 133

CPU time for large-scale instances

Dear friends, I have a question. Note that this inquiry is a question asked by a reviewer and I have to fully address his concern. His concern: " The model is really complex with thousands of constraints. I have difficulty in imaging that the exact method needs few seconds... " Let me explain the pr...
by moosavi_69
5 months ago
Forum: Syntax
Topic: Unknown option (mipstart=1)
Replies: 2
Views: 328

Re: Unknown option (mipstart=1)

Hi, mipstart is not a GAMS but a solver option, see e.g. the CPLEX solver manual: https://www.gams.com/latest/docs/solvers/cplex/index.html#CPLEXmipstart Hence, mipstart needs to be set in a solver option file: https://www.gams.com/latest/docs/solvers/introduction/index.html#BASIC_USAGE_SOLVER_OPTI...
by moosavi_69
6 months ago
Forum: Syntax
Topic: Unknown option (mipstart=1)
Replies: 2
Views: 328

Unknown option (mipstart=1)

Hey guys, I have a problem with GAMS and want you to help me (PLS). I have developed a two step algorithm, in which a heuristic algorithm creates a relatively high quality and feasible solution at the first step, then a MIP-based algorithm (or partial MIP algorithm) improves the solution found at th...