org.netlib.lapack
Class Dlaqsy

java.lang.Object
  org.netlib.lapack.Dlaqsy

public class Dlaqsy
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
 *  =======
 *
 *  DLAQSY 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.
 *
 *  A       (input/output) DOUBLE PRECISION array, dimension (LDA,N)
 *          On entry, the symmetric matrix A.  If UPLO = 'U', the leading
 *          n by n upper triangular part of A contains the upper
 *          triangular part of the matrix A, and the strictly lower
 *          triangular part of A is not referenced.  If UPLO = 'L', the
 *          leading n by n lower triangular part of A contains the lower

 *          triangular part of the matrix A, and the strictly upper
 *          triangular part of A is not referenced.
 *
 *          On exit, if EQUED = 'Y', the equilibrated matrix:
 *          diag(S) * A * diag(S).
 *
 *  LDA     (input) INTEGER
 *          The leading dimension of the array A.  LDA >= max(N,1).
 *
 *  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 *          = 'Y':  Equilibration was done, i.e., A has been replaced by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

Dlaqsy()

Method Summary

static void

dlaqsy(java.lang.String uplo, int n, double[] a, int _a_offset, int lda, 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

Dlaqsy

public Dlaqsy()

Method Detail

dlaqsy

public static void dlaqsy(java.lang.String uplo,
                          int n,
                          double[] a,
                          int _a_offset,
                          int lda,
                          double[] s,
                          int _s_offset,
                          double scond,
                          double amax,
                          StringW equed)