CPXgetslack

int CPXPUBLIC CPXgetslack(CPXCENVptr env, CPXCLPptr lp, double * slack, int begin, int end)

Definition file: cplex.h

Include files: cplex.h

The routine CPXgetslack is used to access the slack values for a range of the constraints of a linear or quadratic program. The beginning and end of the range must be specified. Except for ranged rows, the slack values returned consist of the right-hand side minus the row activity level. For ranged rows, the value returned is the row activity level minus the right-hand side, or, equivalently, the value of the internal structural variable that CPLEX creates to represent ranged rows.

Example

 status = CPXgetslack (env, lp, slack, 0, CPXgetnumrows(env,lp)-1);

Parameters:

env	A pointer to the CPLEX environment as returned by `CPXopenCPLEX`.
lp	A pointer to a CPLEX problem object as returned by `CPXcreateprob`.
slack	An array to receive the values of the slack or surplus variables for each of the constraints. This array must be of length at least (`end` - `begin+1`). If successful, `slack[0]` through `slack[end-begin]` contain the values of the slacks.
begin	An integer indicating the beginning of the range of slack values to be returned.
end	An integer indicating the end of the range of slack values to be returned. Example status = CPXgetslack (env, lp, slack, 0, CPXgetnumrows(env,lp)-1);

Returns:

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