CPXchgqpcoef

Description

The routine CPXchgqpcoef() changes the coefficient in the Q matrix of a quadratic problem 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.

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

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

Arguments

The pointer to the CPLEX environment as returned by CPXopenCPLEX().

A pointer to a CPLEX problem object as returned by CPXcreateprob().

An integer that indicates the first variable number (row number in Q).

An integer that indicates the second variable number (column number in Q).

The new coefficient value.

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