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# XPRSchgmcoef, XPRSchgmcoef64

Purpose
Used to change multiple coefficients in the matrix. If any coefficient does not already exist, it will be added to the matrix. If many coefficients are being added to a row of the matrix, it may be more efficient to delete the old row of the matrix and add a new one.
Topic area
Problem Modification
Synopsis
`int XPRS_CC XPRSchgmcoef(XPRSprob prob, int ncoefs, const int rowind[], const int colind[], const double rowcoef[]);`
``
`int XPRS_CC XPRSchgmcoef64(XPRSprob prob, XPRSint64 ncoefs, const int rowind[], const int colind[], const double rowcoef[]);`
Arguments

prob | The current problem.
ncoefs | Number of new coefficients.
rowind | Integer array of length ncoefs containing the row indices of the coefficients to be changed.
colind | Integer array of length ncoefs containing the column indices of the coefficients to be changed.
rowcoef | Double array of length ncoefs containing the new coefficient values. If an element of rowcoef is zero, the coefficient will be deleted.

Related controls
Double

MATRIXTOL | Tolerance on matrix elements.

Example

    rowind[0] = 0; rowind[1] = 3;
    colind[0] = 1; colind[1] = 5;
    rowcoef[0] = 2.0; rowcoef[1] = 0.0;
    XPRSchgmcoef(prob,2,rowind,colind,rowcoef);

This changes two elements to values 2.0 and 0.0.
Further information
XPRSchgmcoef is more efficient than repeated calls to XPRSchgcoef and should be used in its place if many coefficients are to be changed.
Related topics
XPRSchgcoef, XPRSchgmqobj, XPRSchgobj, XPRSchgqobj, XPRSchgrhs, XPRSgetcols, XPRSgetrhs.
Parent Topic Console and Library Functions

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