edu.emory.mathcs.csparsej.tdouble

Class Dcs_updown

java.lang.Object

edu.emory.mathcs.csparsej.tdouble.Dcs_updown

public class Dcs_updown
extends java.lang.Object

Sparse rank-1 Cholesky update/downate.

Constructor Summary

Constructors

Constructor and Description
Dcs_updown()

Method Summary

Modifier and Type	Method and Description
static boolean	cs_updown(Dcs_common.Dcs L, int sigma, Dcs_common.Dcs C, int[] parent) Sparse Cholesky rank-1 update/downdate, L*L' + sigma*w*w' (sigma = +1 or -1)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Dcs_updown

public Dcs_updown()

Method Detail

cs_updown

public static boolean cs_updown(Dcs_common.Dcs L,
                                int sigma,
                                Dcs_common.Dcs C,
                                int[] parent)

Sparse Cholesky rank-1 update/downdate, L*L' + sigma*w*w' (sigma = +1 or -1)

Parameters:

L - factorization to update/downdate

sigma - +1 for update, -1 for downdate

C - the vector c

parent - the elimination tree of L

Returns:

true if successful, false on error