org.netlib.lapack
Class SLAQGE

java.lang.Object
  org.netlib.lapack.SLAQGE

public class SLAQGE
extends java.lang.Object

SLAQGE is a simplified interface to the JLAPACK routine slaqge.
This interface converts Java-style 2D row-major arrays into
the 1D column-major linearized arrays expected by the lower
level JLAPACK routines.  Using this interface also allows you
to omit offset and leading dimension arguments.  However, because
of these conversions, these routines will be slower than the low
level ones.  Following is the description from the original Fortran
source.  Contact seymour@cs.utk.edu with any questions.

 *     ..
 *
 *  Purpose
 *  =======
 *
 *  SLAQGE equilibrates a general M by N matrix A using the row and
 *  scaling factors in the vectors R and C.
 *
 *  Arguments
 *  =========
 *
 *  M       (input) INTEGER
 *          The number of rows of the matrix A.  M >= 0.
 *
 *  N       (input) INTEGER
 *          The number of columns of the matrix A.  N >= 0.
 *
 *  A       (input/output) REAL array, dimension (LDA,N)
 *          On entry, the M by N matrix A.
 *          On exit, the equilibrated matrix.  See EQUED for the form of

 *          the equilibrated matrix.
 *
 *  LDA     (input) INTEGER
 *          The leading dimension of the array A.  LDA >= max(M,1).
 *
 *  R       (input) REAL array, dimension (M)
 *          The row scale factors for A.
 *
 *  C       (input) REAL array, dimension (N)
 *          The column scale factors for A.
 *
 *  ROWCND  (input) REAL
 *          Ratio of the smallest R(i) to the largest R(i).
 *
 *  COLCND  (input) REAL
 *          Ratio of the smallest C(i) to the largest C(i).
 *
 *  AMAX    (input) REAL
 *          Absolute value of largest matrix entry.
 *
 *  EQUED   (output) CHARACTER*1
 *          Specifies the form of equilibration that was done.
 *          = 'N':  No equilibration
 *          = 'R':  Row equilibration, i.e., A has been premultiplied by

 *                  diag(R).
 *          = 'C':  Column equilibration, i.e., A has been postmultiplied
 *                  by diag(C).
 *          = 'B':  Both row and column equilibration, i.e., A has been
 *                  replaced by diag(R) * A * diag(C).
 *
 *  Internal Parameters
 *  ===================
 *
 *  THRESH is a threshold value used to decide if row or column scaling
 *  should be done based on the ratio of the row or column scaling
 *  factors.  If ROWCND < THRESH, row scaling is done, and if
 *  COLCND < THRESH, column scaling is done.
 *
 *  LARGE and SMALL are threshold values used to decide if row scaling
 *  should be done based on the absolute size of the largest matrix
 *  element.  If AMAX > LARGE or AMAX < SMALL, row scaling is done.
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

SLAQGE()

Method Summary

static void

SLAQGE(int m, int n, float[][] a, float[] r, float[] c, float rowcnd, float colcnd, float amax, StringW equed)

Methods inherited from class java.lang.Object

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

Constructor Detail

SLAQGE

public SLAQGE()

Method Detail

SLAQGE

public static void SLAQGE(int m,
                          int n,
                          float[][] a,
                          float[] r,
                          float[] c,
                          float rowcnd,
                          float colcnd,
                          float amax,
                          StringW equed)