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# XSLPpresolve

Purpose
Perform a nonlinear presolve on the problem
Topic area
Presolve
Synopsis
`int XPRS_CC XSLPpresolve(XSLPprob prob);`
Argument

prob | The current SLP problem.

Related controls
Integer

XSLP_PRESOLVE | Bitmap containing nonlinear presolve options.

Example
The following example reads a problem from file, sets the presolve control, presolves the problem and then solves it (using the "s" flag to enforce a local solve).

    XSLPreadprob(prob, "Matrix", "");
    XSLPsetintcontrol(prob, XSLP_PRESOLVE, 1);
    XSLPpresolve(prob);
    XSLPnlpoptimize(prob, "s")

Further information
If bit 1 of XSLP_PRESOLVE is not set, no nonlinear presolve will be performed. Otherwise, the presolve will be performed in accordance with the bit settings.. XSLPpresolve is called automatically by XSLPconstruct, so there is no need to call it explicitly unless there is a requirement to interrupt the process between presolve and optimization. XSLPpresolve must be called before XSLPconstruct or any of the SLP optimization procedures..
Related topics
XSLP_PRESOLVE
Parent Topic Library functions and the programming interface

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