CPXXcallbackgetrelaxationpoint and CPXcallbackgetrelaxationpoint

Get the solution to the current node relaxation and its objective value for callback invocations with CPX_CALLBACKCONTEXT_RELAXATION or CPX_CALLBACKCONTEXT_BRANCHING.

int CPXXcallbackgetrelaxationpoint( CPXCALLBACKCONTEXptr context, double *x, CPXDIM begin, CPXDIM end, double *obj_p )

int CPXcallbackgetrelaxationpoint( CPXCALLBACKCONTEXptr context, double *x, CPXDIM begin, CPXDIM end, double *obj_p )

Description

Queries the solution to the current node relaxation and its objective value.

Warning: Your call of this function is valid only if the callback was invoked in the contexts CPX_CALLBACKCONTEXT_RELAXATION or CPX_CALLBACKCONTEXT_BRANCHING. In all other contexts, it returns an error.

Arguments

context: The callback context as passed into the callback function.
x: Buffer to store the values queried. The buffer must have size at least 1+end-begin. The buffer can be NULL if begin and end specify an empty range.
begin: First column (inclusive) to query from the relaxed solution.
end: Last column (inclusive) to query from relaxed solution.
obj_p: Buffer to store the objective value of the relaxed solution. This may be NULL.

Return

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