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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
struct RTOp_RTOp_vtbl_t RTOp_ROp_max_near_feas_step_vtbl
int RTOp_ROp_max_near_feas_step_construct (RTOp_value_type beta, struct RTOp_RTOp *op)
int RTOp_ROp_max_near_feas_step_destroy (struct RTOp_RTOp *op)
int RTOp_ROp_max_near_feas_step_set_beta (RTOp_value_type beta, struct RTOp_RTOp *op)
RTOp_ROp_max_near_feas_step_val (RTOp_ReductTarget targ_obj)

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.

Function Documentation

int RTOp_ROp_max_near_feas_step_construct ( RTOp_value_type  beta,
struct RTOp_RTOp op 

Definition at line 289 of file RTOp_ROp_max_near_feas_step.c.

int RTOp_ROp_max_near_feas_step_destroy ( struct RTOp_RTOp op)

Definition at line 297 of file RTOp_ROp_max_near_feas_step.c.

int RTOp_ROp_max_near_feas_step_set_beta ( RTOp_value_type  beta,
struct RTOp_RTOp op 

Definition at line 304 of file RTOp_ROp_max_near_feas_step.c.

struct RTOp_ROp_max_near_feas_step_reduct_obj_t RTOp_ROp_max_near_feas_step_val ( RTOp_ReductTarget  targ_obj) [read]

Definition at line 311 of file RTOp_ROp_max_near_feas_step.c.

Variable Documentation

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