CPXchgqpcoef

int CPXPUBLIC CPXchgqpcoef(CPXCENVptr env, CPXLPptr lp, int i, int j, double newvalue)

Definition file: cplex.h

Include files: cplex.h

The routine CPXchgqpcoef changes the coefficient in the quadratic objective of a quadratic problem (QP) corresponding to the variable pair (i,j) to the value newvalue. If i is not equal to j, both Q(i,j) and Q(j,i) are changed to newvalue.

Example

 status = CPXchgqpcoef (env, lp, 10, 12, 82.5);

Parameters:

env	A pointer to the CPLEX environment as returned by `CPXopenCPLEX`.
lp	A pointer to a CPLEX problem object as returned by `CPXcreateprob`.
i	An integer that indicates the first variable number (row number in `Q`).
j	An integer that indicates the second variable number (column number in `Q`).
newvalue	The new coefficient value.

Returns:

The routine returns zero on success and nonzero if an error occurs.