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# XPRSgetredcosts

Purpose
Returns the reduced costs from the incumbent solution during or after optimization of a continuous problem with XPRSoptimize, XPRSlpoptimize or XPRSnlpoptimize.
Topic areas
Linear Algebra, Solution, LP
Synopsis
`int XPRS_CC XPRSgetredcosts(XPRSprob prob, int *status, double djs[], int first, int last);`
Arguments

prob | The current problem.
status | Information about the reduced costs returned.
djs | Double array of length last-first+1 where the reduced costs for the variables will be returned. May be NULL if not required.
first | First column in the reduced costs.
last | Last column in the reduced costs.

Further information
1. The function always returns data in the input space, even if the problem is currently in presolved state. Column indices should be in the range 0 to INPUTCOLS- 1.
2. The status will be set to XPRS_SOLAVAILABLE_NOTFOUND ( 0), XPRS_SOLAVAILABLE_OPTIMAL ( 1), or XPRS_SOLAVAILABLE_FEASIBLE ( 2).
3. Reduced costs are available when the problem is solved with SLP, Knitro or any LP or convex QP algorithm: the status returned will be the same as for XPRSgetsolution. Reduced costs are not available during or after MIP or global solves: status will be XPRS_SOLAVAILABLE_NOTFOUND.
Related topics
XPRSoptimize, XPRSgetduals, XPRSgetslacks, XPRSgetsolution.
Parent Topic Console and Library Functions

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