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XPRSchgmqobj, XPRSchgmqobj64

Purpose
Used to change multiple quadratic coefficients in the objective function. If any of the coefficients does not exist already, new coefficients will be added to the objective function.
Synopsis
int XPRS_CC XPRSchgmqobj(XPRSprob prob, int ncoefs, const int objqcol1[], const int objqcol2[], const double objqcoef[]);

int XPRS_CC XPRSchgmqobj64(XPRSprob prob, XPRSint64 ncoefs, const int objqcol1[], const int objqcol2[], const double objqcoef[]);
Arguments
prob 
The current problem.
ncoefs 
The number of coefficients to change.
objqcol1 
Integer array of size ncol containing the column index of the first variable in each quadratic term.
objqcol2 
Integer array of size ncol containing the column index of the second variable in each quadratic term.
objqcoef 
New values for the coefficients. If an entry in objqcoef is 0, the corresponding entry will be deleted. These are the coefficients of the quadratic Hessian matrix.
Example
The following code results in an objective function with terms: [6x12 + 3x1x2 + 3x2x1]/2 
objqcol1[0] = 0; objqcol2[0] = 0; objqcoef[0] = 6.0;
objqcol1[1] = 1; objqcol2[1] = 0; objqcoef[1] = 3.0;
XPRSchgmqobj(prob,2,objqcol1,objqcol2,objqcoef);
Further information
1. The columns in the arrays objqcol1 and objqcol2 must already exist in the matrix. If the columns do not exist, they must be added with XPRSaddcols.
2. XPRSchgmqobj is more efficient than repeated calls to XPRSchgqobj and should be used in its place when several coefficients are to be changed.
Related topics
XPRSchgcoef, XPRSchgmcoef, XPRSchgobj, XPRSchgqobj, XPRSgetqobj.

Parent Topic Console and Library Functions

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