XPRSgetduals
Purpose
Returns the dual values from the incumbent solution during or after optimization of a continuous problem with
XPRSoptimize,
XPRSlpoptimize or
XPRSnlpoptimize.
Topic areas
Synopsis
int XPRS_CC XPRSgetduals(XPRSprob prob, int *status, double duals[], int first, int last);
Arguments
|
prob
|
The current problem.
|
|
status
|
Information about the dual solution returned.
|
|
duals
|
Double array of length
last-first+1 where the values of the dual variables will be returned. May be NULL if not required.
|
|
first
|
First row in the dual solution.
|
|
last
|
Last row in the dual solution.
|
Further information
1. The function always returns data in the input space, even if the problem is currently in presolved state. Row indices should be in the range 0 to
INPUTROWS-
1.
2. The
status will be set to
XPRS_SOLAVAILABLE_NOTFOUND (
0),
XPRS_SOLAVAILABLE_OPTIMAL (
1), or
XPRS_SOLAVAILABLE_FEASIBLE (
2).
3. Dual values 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. Dual values are not available during or after MIP or global solves:
status will be
XPRS_SOLAVAILABLE_NOTFOUND.
Related topics
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