CPXgetijdiv

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 CPXgetijdiv returns the index of the diverging row (that is, constraint) or column (that is, variable) when one of the ILOG CPLEX simplex optimizers terminates due to a diverging vector. This function can be called after an unbounded solution status for a primal simplex call or after an infeasible solution status for a dual simplex call.

If one of the ILOG CPLEX simplex optimizers has concluded that the LP problem object is unbounded, and if the diverging variable is a slack or ranged variable, CPXgetijdiv returns the index of the corresponding row in *idiv_p. Otherwise, *idiv_p is set to -1.

If one of the ILOG CPLEX simplex optimizers has concluded that the LP problem object is unbounded, and if the diverging variable is a normal, structural variable, CPXgetijdiv sets *jdiv_p to the index of that variable. Otherwise, *jdiv_p is set to -1.

The pointer to the ILOG CPLEX environment, as returned by CPXopenCPLEX.

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

A pointer to an integer indexing the row of a diverging variable.

A pointer to an integer indexing the column of a diverging variable.

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

CPXgetijdiv

Parameters:

Returns:

env	The pointer to the ILOG CPLEX environment, as returned by `CPXopenCPLEX`.
lp	A pointer to the CPLEX LP problem object, as returned by `CPXcreateprob`.
idiv_p	A pointer to an integer indexing the row of a diverging variable. If one of the ILOG CPLEX simplex optimizers has concluded that the LP problem object is unbounded, and if the diverging variable is a slack or ranged variable, `CPXgetijdiv` returns the index of the corresponding row in `idiv_p`. Otherwise, `idiv_p` is set to `-1`.
jdiv_p	A pointer to an integer indexing the column of a diverging variable. If one of the ILOG CPLEX simplex optimizers has concluded that the LP problem object is unbounded, and if the diverging variable is a normal, structural variable, `CPXgetijdiv` sets `jdiv_p` to the index of that variable. Otherwise, `jdiv_p` is set to `-1`.