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XPRSchgmcoef, XPRSchgmcoef64

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.
Synopsis
int XPRS_CC XPRSchgmcoef(XPRSprob prob, int nels, const int mrow[], const int mcol[], const double dval[]);

int XPRS_CC XPRSchgmcoef64(XPRSprob prob, XPRSint64 nels, const int mrow[], const int mcol[], const double dval[]);
Arguments
prob 
The current problem.
nels 
Number of new coefficients.
mrow 
Integer array of length nels containing the row indices of the coefficients to be changed.
mcol 
Integer array of length nels containing the column indices of the coefficients to be changed.
dval 
Double array of length nels containing the new coefficient values. If an element of dval is zero, the coefficient will be deleted.
Related controls
Double
MATRIXTOL 
Tolerance on matrix elements.

Example 
mrow[0] = 0; mrow[1] = 3;
mcol[0] = 1; mcol[1] = 5;
dval[0] = 2.0; dval[1] = 0.0;
XPRSchgmcoef(prob,2,mrow,mcol,dval);
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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