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XPRBgetctrrng

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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; XPRB_LOACT  lower activity; XPRB_UUP  upper unit cost; XPRB_UDN  lower unit cost.

Return value

Ranging informationof 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);
 ...
XPRBsolve(expl2, "l");
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.

Related topics

XPRBnewctr,XPRBgetvarrng.

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