RTOp_ROp_max_near_feas_step.h File Reference

#include "RTOp.h"

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struct  RTOp_ROp_max_near_feas_step_reduct_obj_t

Detailed Description

Reduction operator for finding the maximum near feasibl step.

targ_obj <- { max alpha | v[0] - beta <= v[1] + alpha * v[2] <= v[3] + beta }

This is a specialized reduction operation that is used in many optimization methods to find the maximum step length alpha# such that the iterates remain positive. This reduction operation returns a target object which consists of a set of values targ_obj = { alpha_pos, alpha_neg }. Here, alpha_pos# and alpha_neg are the largets positive and negative steps alpha# respectively that satifies the relaxed bounds. If alpha_pos < 0.0 on return then this is a flag that v[1]# is already out of bounds and the value of alpha_neg is insignificant.

This operator is defined to allow exactly four vector arguments (num_vecs == 2) v[0], v[1], and can only handle dense vectors.

Definition in file RTOp_ROp_max_near_feas_step.h.

Generated on Thu Sep 18 12:33:39 2008 for RTOpPack: Extra C/C++ Code for Vector Reduction/Transformation Operators by doxygen