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XPRSfixglobal

FIXGLOBAL

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Purpose

Fixes all the global entities to the values of the last found MIP solution. This is useful for finding the reduced costs for the continuous variables after the global variables have been fixed to their optimal values.

Synopsis

int XPRS_CC XPRSfixglobal(XPRSprob prob);

FIXGLOBAL

Argument

prob	The current problem.

Example 1 (Library)

This example performs a global search on problem myprob and then uses XPRSfixglobal before solving the remaining linear problem:

XPRSreadprob(prob,"myprob","");
XPRSminim(prob,"g");
XPRSfixglobal(prob);
XPRSminim(prob,"l");
XPRSwriteprtsol(prob);

Example 2 (Console)

A similar set of commands at the console would be as follows:

READPROB 
MINIM -g
FIXGLOBAL
MINIM -l
PRINTSOL

Further information

This command is useful for inspecting the reduced costs of the continuous variables in a matrix after the global entities have been fixed. Sensitivity analysis can also be performed on the continuous variables in a MIP problem using XPRSrange (RANGE) after calling XPRSfixglobal (FIXGLOBAL).

Related topics

XPRSglobal (GLOBAL), XPRSrange (RANGE).

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