lp_get(++ParamName, ?Value)

ParamName

Atom

Value

Variable, integer, float or atom

Calling Modes

• lp_get(++, -)
• lp_get(++, +)

Description

optimizer

Returns the name of the external solver, currently 'cplex' or 'xpress'.

optimizer_version

Returns an integer derived from the version of the external solver.

presolve

Returns the default presolve setting for solver setup, i.e. the presolve setting that a solver state would be given if it was not directly specified during setup in lp_setup or lp_demon_setup. The value is 1 if the default is to have presolve on, and 0 if off. Note that this is a change from previous versions of eplex, where this parameter is directly connected to the external solver's own presolve parameter. However, the solver may have more than one parameter for presolve settings, and these may take on more values than 0 and 1. In such cases, eplex will set the parameters(s) to some default value(s) corresponding to presolve being off and on. These parameters can be accessed directly using the optimizer_param option if required.

standalone

Value is `yes', as this is the stand-alone version of Eplex. as the external solver is used for keeping the bounds. This option allows programmer to write code that needs to distinguish between the stand-alone and the non-stand-alone versions of Eplex.

optimizer_param(Param)

Get the Value of the external solver's parameter Param. The exact behaviour and available parameters are dependent on the external solver: if the external solver has only problem specific parameters (e.g. XPRESS-MP 13 and later), this gets the default setting that would be used for new problems; if the external solver has global parameters, this gets the global value for the parameter. If Param is not a valid parameter for the solver, an out of range error is raised. See lp_get/3 for more details on the parameters.

timeout

Get the Value of the external solver's timeout parameter. This is an alias for the actual optimizer_param's name.

See Also