org.netlib.lapack
Class Dlaqsp

java.lang.Object
  org.netlib.lapack.Dlaqsp

public class Dlaqsp
extends java.lang.Object

Following is the description from the original
Fortran source.  For each array argument, the Java
version will include an integer offset parameter, so
the arguments may not match the description exactly.
Contact seymour@cs.utk.edu with any questions.


 *     ..
 *
 *  Purpose
 *  =======
 *
 *  DLAQSP equilibrates a symmetric matrix A using the scaling factors
 *  in the vector S.
 *
 *  Arguments
 *  =========
 *
 *  UPLO    (input) CHARACTER*1
 *          Specifies whether the upper or lower triangular part of the
 *          symmetric matrix A is stored.
 *          = 'U':  Upper triangular
 *          = 'L':  Lower triangular
 *
 *  N       (input) INTEGER
 *          The order of the matrix A.  N >= 0.
 *
 *  AP      (input/output) DOUBLE PRECISION array, dimension (N*(N+1)/2)

 *          On entry, the upper or lower triangle of the symmetric matrix
 *          A, packed columnwise in a linear array.  The j-th column of A
 *          is stored in the array AP as follows:
 *          if UPLO = 'U', AP(i + (j-1)*j/2) = A(i,j) for 1<=i<=j;
 *          if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = A(i,j) for j<=i<=n.
 *
 *          On exit, the equilibrated matrix:  diag(S) * A * diag(S), in

 *          the same storage format as A.
 *
 *  S       (input) DOUBLE PRECISION array, dimension (N)
 *          The scale factors for A.
 *
 *  SCOND   (input) DOUBLE PRECISION
 *          Ratio of the smallest S(i) to the largest S(i).
 *
 *  AMAX    (input) DOUBLE PRECISION
 *          Absolute value of largest matrix entry.
 *
 *  EQUED   (output) CHARACTER*1
 *          Specifies whether or not equilibration was done.
 *          = 'N':  No equilibration.
 *          = 'Y':  Equilibration was done, i.e., A has been replaced by

 *                  diag(S) * A * diag(S).
 *
 *  Internal Parameters
 *  ===================
 *
 *  THRESH is a threshold value used to decide if scaling should be done

 *  based on the ratio of the scaling factors.  If SCOND < THRESH,
 *  scaling is done.
 *
 *  LARGE and SMALL are threshold values used to decide if scaling should
 *  be done based on the absolute size of the largest matrix element.
 *  If AMAX > LARGE or AMAX < SMALL, scaling is done.
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

Dlaqsp()

Method Summary

static void

dlaqsp(java.lang.String uplo, int n, double[] ap, int _ap_offset, double[] s, int _s_offset, double scond, double amax, StringW equed)

Methods inherited from class java.lang.Object

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

Constructor Detail

Dlaqsp

public Dlaqsp()

Method Detail

dlaqsp

public static void dlaqsp(java.lang.String uplo,
                          int n,
                          double[] ap,
                          int _ap_offset,
                          double[] s,
                          int _s_offset,
                          double scond,
                          double amax,
                          StringW equed)