XPRBgetctrrng

Purpose

Get ranging information for a constraint.

Synopsis

double XPRBgetctrrng(XPRBctr ctr, int rngtype);

Arguments

ctr

Reference to a previously created constraint.

rngtype

The type of ranging information sought. This is one of:

XPRB_UPACT	upper activity (= the level to which the constraint activity may be increased at a cost per unit of increase given by the XPRB_UUP value, ignoring the upper bound on the constraint as specified by its RHS);
XPRB_LOACT	lower activity (= the level to which the constraint activity may be decreased at a cost per unit of decrease given by the XPRB_UDN value, ignoring the lower bound on the constraint as specified by its RHS);
XPRB_UUP	upper unit cost;
XPRB_UDN	lower unit cost.

Return value

Ranging information of the required type.

Example

The following returns the upper activity value of the constraint ctr1.

XPRBprob expl2;
XPRBctr ctr1;
double upact;
expl2 = XPRBnewprob("example2");
ctr1 = XPRBnewctr(expl2, "r1", XPRB_E);
 ...
XPRBlpoptimize(expl2, "");
upact = XPRBgetctrrng(ctr1, XPRB_UPACT);

Further information

This method can only be used after solving an LP problem. Ranging information for MIP problems can be obtained by fixing all discrete variables to their solution values and re-solving the resulting LP problem.

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XPRBgetctrrng

XPRBgetctrrng