Vtrace options how to#

Options that Control Solver-Specific Parameters and Options that Control the Choice of Solver for the list of solve-related options that can be set via the option statement, and.

Solver-Related Options for the list of solve-related options that can be set via the command line,.

Unfortunately, not every option can be via as command line parameter, option statement, and model attribute. If none of these methods is used to set an option, default values apply.įurther, one can unset any model-specific option by assigning it the value NA: erlim = NA The model suffix takes precedence over the option statement, which takes precendence over the command line parameters. GAMS options can be set on the GAMS command line, e.g., $ gams trnsport iterlim = 100Īdditionally, they can be set by an option statement within a GAMS model, e.g., option iterlim = 100 įinally, a model attribute can set a GAMS option for an individual model: erlim = 100

Vtrace options how to#

This will be discussed in Starting Point and Initial Basis.įurther solver specific topics, which are more interesting for advanced users, are discussed in the Sections Solve trace and Branch-and-Cut-and-Heuristic Facility (BCH).įor some hints on how to select a solver, see Choosing an appropriate Solver. However, use of generic GAMS options should be preferred, since a GAMS option setting applies to all solvers and is interpreted by the solvers in a consistent way.Ī number of solvers can make use of an initialization of variable and equation values. These can be set via a solver specific options file, which will be discussed in Section The Solver Options File.

Further, most solvers allow the user to set additional, solver-specific options. Section Controlling a Solver via GAMS Options describes how to set the GAMS options that control a solver. While this is enough for some users, most will quickly find they need some basic knowledge of how to control the solver and interpret the results. No knowledge of solver options or solver specific return codes is required. For the novice GAMS user, solver usage can be very simple: one runs the model and inspects the listing file to see what the solution is.