CPXXchgrngval and CPXchgrngval

The routine CPXXchgrngval/CPXchgrngval changes the range coefficients of a set of linear constraints in the CPLEX problem object.

int CPXXchgrngval( CPXCENVptr env, CPXLPptr lp, CPXDIM cnt, CPXDIM const * indices, double const * values )

int CPXchgrngval( CPXCENVptr env, CPXLPptr lp, int cnt, int const * indices, double const * values )

Description

The routine CPXXchgrngval/CPXchgrngval changes the range coefficients of a set of linear constraints in the CPLEX problem object.

Note that changing the range coefficients will not change the sense of a constraint. You must call CPXXchgsense/CPXchgsense to change the sense of a ranged row if the previous range coefficient was 0 (zero) and the constraint sense was not 'R'. Similarly, changing the range coefficient from a nonzero value to 0 (zero) will not change the constraint sense from 'R' to 'E'; an additional call of CPXXchgsense/CPXchgsense is required to accomplish that.

Arguments

env: A pointer to the CPLEX environment as returned by CPXXopenCPLEX/CPXopenCPLEX.
lp: A pointer to a CPLEX problem object as returned by CPXXcreateprob/CPXcreateprob.
cnt: An integer that specifies the total number of range coefficients to be changed, and thus specifies the length of the arrays indices and values.
indices: An array of length cnt containing the numeric indices of the rows corresponding to the linear constraints for which range coefficients are to be changed.
values: An array of length cnt containing the new values of the range coefficients of the linear constraints present in indices.

Return

The routine returns 0 (zero) if successful and nonzero if an error occurs.

Example


status = CPXchgrngval (env, lp, cnt, indices, values);