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# lp_get(++ParamName, ?Value)

Obtain the value of a global parameter.

ParamName
  Atom or structure
Value
  Variable, integer, float or atom

## Description

Eplex has a number of global (i.e. not specific to a particular problem) parameters. These can be queried using this predicate.

`has_indicator_constraints`
  Returns 'yes' if the solver supports =≥/2 indicator constraints, else 'no'.
`has_miqp`
  Returns 'yes' if the solver supports mixed integer problems with quadratic objectives, else 'no'.
`has_qp`
  Returns 'yes' if the solver supports quadratic objectives, else 'no'.
`has_sos`
  Returns 'yes' if the solver supports special ordered sets (SOS), i.e. the sos1/1 and sos2/1 constraints. else 'no'.
`optimizer`
  Returns the name of the external solver, currently 'cplex', 'glpk', 'gurobi', 'osi' or 'xpress'.
`optimizer_version`
  Returns an integer derived from the version of the external solver (for osi, the version is the actual solvers used, including any significant third-party packages such as sparse matrix ordering packages required by the barrier 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. A value of 0 disables presolving. A value of 1 either enables presolving (for external solvers that have only global parameters), or uses the default optimizer_param settings (for external solvers with per-problem parameters).
`timeout`
  Returns the default time-out setting that a solver state would be given if it was not directly specified during setup. Value is 0 if there is no time-out.
`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.

### Modes and Determinism

- lp_get(++, -)
- lp_get(++, +)

## See Also

lp_set / 2