linear_algebra
Class SVDC_j

java.lang.Object
  |
  +--linear_algebra.SVDC_j

public class SVDC_j

extends java.lang.Object

This class contains the LINPACK DSVDC (singular value decomposition) routine.

IMPORTANT: The "_j" suffixes indicate that these routines use Java/C style indexing. For example, you will see

   for (i = 0; i < n; i++)

rather than

   for (i = 1; i <= n; i++)

To use the "_j" routines you will have to fill elements 0 through n - 1 rather than elements 1 through n. Versions of these programs that use FORTRAN style indexing are also available. They end with the suffix "_f77".

This class was translated by a statistician from FORTRAN versions of the LINPACK routines. It is NOT an official translation. When public domain Java numerical analysis routines become available from the people who produce LAPACK, then THE CODE PRODUCED BY THE NUMERICAL ANALYSTS SHOULD BE USED.

Meanwhile, if you have suggestions for improving this code, please contact Steve Verrill at steve@ws10.fpl.fs.fed.us.

Constructor Summary

SVDC_j()

Method Summary

static void

dsvdc_j(double[][] x, int n, int p, double[] s, double[] e, double[][] u, double[][] v, double[] work, int job) This method decomposes a n by p matrix X into a product UDV´ where ...

Methods inherited from class java.lang.Object

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

Constructor Detail

SVDC_j

public SVDC_j()

Method Detail

dsvdc_j

public static void dsvdc_j(double[][] x,
                           int n,
                           int p,
                           double[] s,
                           double[] e,
                           double[][] u,
                           double[][] v,
                           double[] work,
                           int job)
                    throws SVDCException

This method decomposes a n by p matrix X into a product UDV´ where ... For details, see the comments in the code. This method is a translation from FORTRAN to Java of the LINPACK subroutine DSVDC. In the LINPACK listing DSVDC is attributed to G.W. Stewart with a date of 3/19/79. Translated by Steve Verrill, March 3, 1997.

Parameters:

x - The matrix to be decomposed

n - The number of rows of X

p - The number of columns of X

s - The singular values of X

e - See the documentation in the code

u - The left singular vectors

v - The right singular vectors

work - A work array

job - See the documentation in the code

SVDCException