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# problem.chgMCoef

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 areas
Problem Modification, Optimizer
Synopsis
`problem.chgMCoef(rowind, colind, rowcoef)`
Arguments

rowind: list[constraint] | Integer array containing the row indices of the coefficients to be changed.
colind: list[var] | Integer array containing the column indices of the coefficients to be changed.
rowcoef: list[float] | Double array 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.

Further information
1. problem.chgMCoef is more efficient than repeated calls to problem.chgCoef and should be used in its place if many coefficients are to be changed.
2. Argument rowind may contain either xpress.constraint objects or integer indices.
3. Argument colind may contain either xpress.var objects or integer indices.
Related topics
problem.chgCoef, problem.chgMQObj, problem.chgObj, problem.chgQObj, problem.chgRHS, problem.getCols, problem.getRHS.
Parent Topic Xpress problem object methods

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