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XPRSgetslacks

Purpose
Used to obtain the slack values following optimization with XPRSoptimize.
Synopsis
int XPRS_CC XPRSgetslacks(XPRSprob prob, int *status, double slacks[], const int first, const int last);
Arguments
prob 
The current problem.
status 
Information about the slacks returned.
slacks 
Double pointer where the value of the slack variables will be returned. May be NULL if not required.
first 
First row in the slacks.
last 
Last row in the slacks.
Example
The following brings the 7th variable into the basis and removes the 5th: 
int nrows;
int nsparerows;
XPRSgetintattrib(prob,XPRS_ROWS,&nrows);
XPRSgetintattrib(prob,XPRS_SPAREROWS,&nsparerows);
XPRSpivot(prob,nrows + nsparerows + 6,nrows + nsparerows + 4)
Further information
1. The function always returns data in the original space, even if the problem is currently in presolved state.
2. The status can take the same values as SOLSTATUS.
3. Can also be used after calling XPRSlpoptimize and XPRSmipoptimize however is it best practice to access the relevant solutions by XPRSgetlpsol and XPRSgetmipsol when a specific problem type has been optimized.
4. Cannot be used inside callbacks: use XPRSgetlpsol and XPRSgetmipsol instead.
Related topics
XPRSoptimize, XPRSgetduals, XPRSgetsolution, XPRSgetredcosts

Parent Topic Console and Library Functions

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