CPXuncrushform

Note

This is an advanced routine. Advanced routines typically demand a thorough 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 CPXuncrushform uncrushes a linear formula of the presolved problem to a linear formula of the original problem.

Let cols = CPXgetnumcols (env, lp). If ind[i] < cols then the ith variable in the formula is variable with index ind[i] in the original problem. If ind[i] >= cols, then the ith variable in the formula is the slack for the (ind[i] - cols)th ranged row. The arrays ind and val must be of length at least the number of columns plus the number of ranged rows in the original LP problem object.

Example

 status = CPXuncrushform (env, lp, plen, pind, pval,
                          &len, &offset, ind, val);

A pointer to the CPLEX environment, as returned by CPXopenCPLEX.

A pointer to a CPLEX LP problem object, as returned by CPXcreateprob.

The number of entries in the arrays pind and pval.

The linear formula in terms of the presolved problem. Each entry, pind[i], indicates the column index of the corresponding coefficient, pval[i].

A pointer to an integer to receive the number of nonzero coefficients, that is, the true length of the arrays ind and val.

A pointer to a double to contain the value of the linear formula corresponding to variables that have been removed in the presolved problem.

The linear formula in terms of the original problem.

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

CPXuncrushform

Parameters:

Returns:

env	A pointer to the CPLEX environment, as returned by `CPXopenCPLEX`.
lp	A pointer to a CPLEX LP problem object, as returned by `CPXcreateprob`.
plen	The number of entries in the arrays `pind` and `pval`.
pval	The linear formula in terms of the presolved problem. Each entry, `pind[i]`, indicates the column index of the corresponding coefficient, `pval[i]`.
len_p	A pointer to an integer to receive the number of nonzero coefficients, that is, the true length of the arrays `ind` and `val`.
offset_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.
val	The linear formula in terms of the original problem.