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problem.chgCoef

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
problem.chgCoef(row, col, coef)
Arguments
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.

Further information
1. problem.chgMCoef is more efficient than multiple calls to problem.chgCoef and should be used in its place in such circumstances.
2. Argument row may contain xpress.constraint objects instead of indices.
3. Argument col may contain xpress.var objects instead of indices.
Related topics
problem.addCols, problem.addRows, problem.chgMCoef, problem.chgMQObj, problem.chgObj, problem.chgQObj, problem.chgRHS, problem.getCols, problem.getRows.

Parent Topic Methods of the class problem

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