edu.emory.mathcs.csparsej.tdouble

Class Dcs_scatter

java.lang.Object

edu.emory.mathcs.csparsej.tdouble.Dcs_scatter

public class Dcs_scatter
extends java.lang.Object

Scatter a sparse vector.

Constructor Summary

Constructors

Constructor and Description
Dcs_scatter()

Method Summary

Modifier and Type	Method and Description
static int	cs_scatter(Dcs_common.Dcs A, int j, double beta, int[] w, double[] x, int mark, Dcs_common.Dcs C, int nz) Scatters and sums a sparse vector A(:,j) into a dense vector, x = x + beta * A(:,j).

Methods inherited from class java.lang.Object

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

Constructor Detail

Dcs_scatter

public Dcs_scatter()

Method Detail

cs_scatter

public static int cs_scatter(Dcs_common.Dcs A,
                             int j,
                             double beta,
                             int[] w,
                             double[] x,
                             int mark,
                             Dcs_common.Dcs C,
                             int nz)

Scatters and sums a sparse vector A(:,j) into a dense vector, x = x + beta * A(:,j).

Parameters:

A - the sparse vector is A(:,j)

j - the column of A to use

beta - scalar multiplied by A(:,j)

w - size m, node i is marked if w[i] = mark

x - size m, ignored if null

mark - mark value of w

C - pattern of x accumulated in C.i

nz - pattern of x placed in C starting at C.i[nz]

Returns:

new value of nz, -1 on error