CPXcrushform

int CPXPUBLIC CPXcrushform(CPXCENVptr env, CPXCLPptr lp, int len, const int * ind, const double * val, int * plen_p, double * poffset_p, int * pind, double * pval)

Definition file: cplex.h

Include files: cplex.h

Note

This is an advanced routine. Advanced routines typically demand a profound understanding of the algorithms used by ILOG CPLEX. Thus they incur a higher risk of incorrect behavior in your application, behavior that can be difficult to debug. Therefore, ILOG encourages you to consider carefully whether you can accomplish the same task by means of other Callable Library routines instead.

The routine CPXcrushform crushes a linear formula of the original problem to a linear formula of the presolved problem.

Example

 status = CPXcrushform (env, lp, len, ind, val,
                        &plen, &poffset, pind, pval);

Parameters:

env	A pointer to the CPLEX environment, as returned by `CPXopenCPLEX`.
lp	A pointer to a CPLEX LP problem object, as returned by `CPXcreateprob`.
len	The number of entries in the arrays `ind` and `val`.
ind	An array to hold the column indices of coefficients in the array `val`.
val	The linear formula in terms of the original problem. Each entry, `ind[i]`, indicates the column index of the corresponding coefficient, `val[i]`.
plen_p	A pointer to an integer to receive the number of nonzero coefficients, that is, the true length of the arrays `pind` and `pval`.
poffset_p	A pointer to a double to contain the value of the linear formula corresponding to variables that have been removed in the presolved problem.
pind	An array to hold the column indices of coefficients in the presolved problem in the array `pval`.
pval	The linear formula in terms of the presolved problem. Each entry, `pind[i]`, indicates the column index in the presolved problem of the corresponding coefficient, `pval[i]`. The arrays `pind` and `pval` must be of length at least the number of columns in the presolved LP problem object.

Returns:

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