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Tips and Tricks - The official GAMS FAQ

This is a list of Frequently Asked Questions (FAQ) related to GAMS along with the answers. Please let us know if you have any particular question(s) that you would like us to add to this list.

• GENERAL
• Sleep.exe with millisecond resultion
• How can a GAMS process communicate with another process
• Continuing subsequent solves in a loop after GAMS execution error abort
• Solver option file not found (wrong file extension)
• Keeping GAMS memory constant for multiple solves in a loop
• How can I access environment variables inside GAMS
• Command Line Parameters
• The Solver Option File
• Special MIP features
• Special NLP features
• The FOR statement
• The WHILE statement
• The IF-ELSE statement
• What is optca/optcr?
• GAMS/Virus Scanner incompatibility
• How can I enumerate all possible subsets of a set
• A scalar drives the length of a set
• Adding a constraint to a model and do a warm start
• Tabulators in GAMS
• How do I reduce the size of my listing (.LST) file?
• Multiple solutions of a MIP
• Linearization of multi dimensional parameter
• Static set is not ordered
• What is GAMS
• Random number generator in GAMS
• MODELING
• Missing trig functions (arccos, arcsin, tan)
• Sensitivity analysis (parameter ranges) for LP
• How large should BIG M be?
• Reusing optimal values
• How do I model piecewise linear functions?
• Smooth approximations for MAX(X,0) and MIN(X,0)
• Modeling permutations
• MIN function, don't use it
• PLATFORM
• How can a GAMS process communicate with another process
• How to get 3 GB of memory for a single process under Windows XP Professional
• GAMS crash after upgrade to Windows 2000
• How do I run GAMS in the background on a UNIX machine?
• Finding GAMS errors using the vi editor
• How much memory does my UNIX box have ?
• Missing /bin/csh on AIX
• GAMS/CPLEX license transfer with the GAMSIDE
• Excecuting GAMS using the run command in Windows
• How to use GAMS from a Unix shell
• How to execute GAMS from different directories
• SOLVER
• CPLEX: Fixed LP of a MIP is infeasible
• Not enough memory to solve my problem with OSL.
• Why do various MIP solvers give differing answers to my problem ?
• What do I do if OSL crashes without warning ?
• How do I interrupt a solver?
• What is optca/optcr?
• GAMS/CPLEX license transfer with the GAMSIDE
• GAMS/Virus Scanner incompatibility
• Adding a constraint to a model and do a warm start
• Multiple solutions of a MIP
• How to use option files