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XPRSchgobjn

Purpose
Modifies one or more coefficients of an objective function in a multi-objective problem. If the objective already exists, any coefficients not present in the colind and objcoef arrays will unchanged. If the objective does not exist, it will be added to the problem.
Topic areas
Problem Modification, Multiobjective
Synopsis
int XPRS_CC XPRSchgobjn(XPRSprob prob, int objidx, int ncols, const int colind[], const double objcoef[]);
Arguments
prob 
The current problem.
objidx 
Index of the objective function to add or modify.
ncols 
Number of objective function coefficient elements to change.
colind 
Integer array of length ncols containing the indices of the columns whose objective coefficients will change. An index of -1 indicates that the fixed part of the objective function on the right hand side should change.
objcoef 
Double array of length ncols giving the new objective function coefficients.
Example
Changing three coefficients of the first objective function: 
colind[0] = 0; colind[1] = 2; colind[2] = 5;
objcoef[0] = 25.0; objcoef[1] = 5.3; objcoef[2] = 0.0;
XPRSchgobjn(prob,0,3,colind,objcoef);
See also example goalprog.c.
Further information
1. When objidx=0, this function is equivalent to XPRSchgobj.
2. Any objectives with idx < objidx that do not already exist will be added to the problem with all zero coefficients.
3. This function cannot be called while the current problem is being solved or when it is in an interrupted state. Use XPRSpostsolve to restore the problem to a non-solving state.
Related topics
XPRSaddobj, XPRSgetobjn, XPRSdelobj, XPRSchgobj.

Parent Topic Console and Library Functions

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