org.netlib.lapack
Class SLAS2

java.lang.Object
  org.netlib.lapack.SLAS2

public class SLAS2
extends java.lang.Object

SLAS2 is a simplified interface to the JLAPACK routine slas2.
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
 *  =======
 *
 *  SLAS2  computes the singular values of the 2-by-2 matrix
 *     [  F   G  ]
 *     [  0   H  ].
 *  On return, SSMIN is the smaller singular value and SSMAX is the
 *  larger singular value.
 *
 *  Arguments
 *  =========
 *
 *  F       (input) REAL
 *          The (1,1) element of the 2-by-2 matrix.
 *
 *  G       (input) REAL
 *          The (1,2) element of the 2-by-2 matrix.
 *
 *  H       (input) REAL
 *          The (2,2) element of the 2-by-2 matrix.
 *
 *  SSMIN   (output) REAL
 *          The smaller singular value.
 *
 *  SSMAX   (output) REAL
 *          The larger singular value.
 *
 *  Further Details
 *  ===============
 *
 *  Barring over/underflow, all output quantities are correct to within
 *  a few units in the last place (ulps), even in the absence of a guard

 *  digit in addition/subtraction.
 *
 *  In IEEE arithmetic, the code works correctly if one matrix element is
 *  infinite.
 *
 *  Overflow will not occur unless the largest singular value itself
 *  overflows, or is within a few ulps of overflow. (On machines with
 *  partial overflow, like the Cray, overflow may occur if the largest
 *  singular value is within a factor of 2 of overflow.)
 *
 *  Underflow is harmless if underflow is gradual. Otherwise, results
 *  may correspond to a matrix modified by perturbations of size near
 *  the underflow threshold.
 *
 *  ====================================================================

 *
 *     .. Parameters ..

Constructor Summary

SLAS2()

Method Summary

static void

SLAS2(float f, float g, float h, floatW ssmin, floatW ssmax)

Methods inherited from class java.lang.Object

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

Constructor Detail

SLAS2

public SLAS2()

Method Detail

SLAS2

public static void SLAS2(float f,
                         float g,
                         float h,
                         floatW ssmin,
                         floatW ssmax)