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# XPRSchgobj

Purpose
Used to change the objective function coefficients.
Topic area
Problem Modification
Synopsis
`int XPRS_CC XPRSchgobj(XPRSprob prob, int ncols, const int colind[], const double objcoef[]);`
Arguments

prob | The current problem.
ncols | Number of objective function coefficient elements to change.
colind | Integer array of length ncols 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 of length ncols giving the new objective function coefficients.

Example
Changing three coefficients of the objective function with XPRSchgobj :

    colind[0] = 0; colind[1] = 2; colind[2] = 5;
    objcoef[0] = 25.0; objcoef[1] = 5.3; objcoef[2] = 0.0;
    XPRSchgobj(prob,3,colind,objcoef);

See also examples els_managedcuts.c, els_usercuts.c, globjpar.c, goalprog.c.
Further information
The value of the fixed part of the objective function can be obtained using the OBJRHS problem attribute.
Related topics
XPRSchgcoef, XPRSchgmcoef, XPRSchgmqobj, XPRSchgqobj, XPRSgetobj.
Parent Topic Console and Library Functions

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