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XPRSchgcoef

Purpose
Used to change a single coefficient in the matrix. If the coefficient does not already exist, a new coefficient 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 row.
Topic area
Problem Modification
Synopsis
int XPRS_CC XPRSchgcoef(XPRSprob prob, int row, int col, double coef);
Arguments
prob 
The current problem.
row 
Row index for the coefficient.
col 
Column index for the coefficient.
coef 
New value for the coefficient. If coef is zero, any existing coefficient will be deleted.
Related controls
Double
MATRIXTOL 
Tolerance on matrix elements.

Example
In the following, the element in row 2, column 1 of the matrix is changed to 0.33: 
XPRSchgcoef(prob,2,1,0.33);
Further information
XPRSchgmcoef is more efficient than multiple calls to XPRSchgcoef and should be used in its place in such circumstances.
Related topics
XPRSaddcols, XPRSaddrows, XPRSchgmcoef, XPRSchgmqobj, XPRSchgobj, XPRSchgqobj, XPRSchgrhs, XPRSgetcols, XPRSgetrows.

Parent Topic Console and Library Functions

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