Initializing help system before first use

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 
the largest value which the constraint RHS can take while the current basis remains optimal;
XPRB_LOACT 
the smallest value which the constraint RHS can take while the current basis remains optimal;
XPRB_UUP 
the change in objective value per unit increase in the constraint RHS, assuming the the current basis remains optimal;
XPRB_UDN 
the change in objective value per unit decrease in the constraint RHS, assuming the the current basis remains optimal.
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.
Related topics
XPRBnewctr, XPRBgetvarrng.

Parent Topic BCL C library functions

© 2001-2024 Fair Isaac Corporation. All rights reserved. This documentation is the property of Fair Isaac Corporation (“FICO”). Receipt or possession of this documentation does not convey rights to disclose, reproduce, make derivative works, use, or allow others to use it except solely for internal evaluation purposes to determine whether to purchase a license to the software described in this documentation, or as otherwise set forth in a written software license agreement between you and FICO (or a FICO affiliate). Use of this documentation and the software described in it must conform strictly to the foregoing permitted uses, and no other use is permitted.