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# problem.chgObj

Purpose
Used to change the objective function coefficients.
Topic areas
Problem Modification, Optimizer
Synopsis
`problem.chgObj(colind, objcoef)`
Arguments

colind | Integer array containing the indices of the columns whose objective coefficients will change. An index of -1 indicates that the fixed part of the objective function on the right hand side should change.
objcoef | Double array giving the new objective function coefficients.

Further information
1. The value of the fixed part of the objective function can be obtained using the OBJRHS problem attribute.
2. Argument colind may contain xpress.var objects instead of indices.
Related topics
problem.chgCoef, problem.chgMCoef, problem.chgMQObj, problem.chgQObj, problem.getObj.
Parent Topic Methods of the class problem

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