org.netlib.lapack
Class SLANV2

java.lang.Object
  org.netlib.lapack.SLANV2

public class SLANV2
extends java.lang.Object

SLANV2 is a simplified interface to the JLAPACK routine slanv2.
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
 *  =======
 *
 *  SLANV2 computes the Schur factorization of a real 2-by-2 nonsymmetric
 *  matrix in standard form:
 *
 *       [ A  B ] = [ CS -SN ] [ AA  BB ] [ CS  SN ]
 *       [ C  D ]   [ SN  CS ] [ CC  DD ] [-SN  CS ]
 *
 *  where either
 *  1) CC = 0 so that AA and DD are real eigenvalues of the matrix, or
 *  2) AA = DD and BB*CC < 0, so that AA + or - sqrt(BB*CC) are complex
 *  conjugate eigenvalues.
 *
 *  Arguments
 *  =========
 *
 *  A       (input/output) REAL            
 *  B       (input/output) REAL            
 *  C       (input/output) REAL            
 *  D       (input/output) REAL            
 *          On entry, the elements of the input matrix.
 *          On exit, they are overwritten by the elements of the
 *          standardised Schur form.
 *
 *  RT1R    (output) REAL 
 *  RT1I    (output) REAL            
 *  RT2R    (output) REAL            
 *  RT2I    (output) REAL            
 *          The real and imaginary parts of the eigenvalues. If the
 *          eigenvalues are a complex conjugate pair, RT1I > 0.
 *
 *  CS      (output) REAL            
 *  SN      (output) REAL            
 *          Parameters of the rotation matrix.
 *
 *  Further Details
 *  ===============
 *
 *  Modified by V. Sima, Research Institute for Informatics, Bucharest,
 *  Romania, to reduce the risk of cancellation errors,
 *  when computing real eigenvalues, and to ensure, if possible, that
 *  abs(RT1R) >= abs(RT2R).
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

SLANV2()

Method Summary

static void

SLANV2(floatW a, floatW b, floatW c, floatW d, floatW rt1r, floatW rt1i, floatW rt2r, floatW rt2i, floatW cs, floatW sn)

Methods inherited from class java.lang.Object

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

Constructor Detail

SLANV2

public SLANV2()

Method Detail

SLANV2

public static void SLANV2(floatW a,
                          floatW b,
                          floatW c,
                          floatW d,
                          floatW rt1r,
                          floatW rt1i,
                          floatW rt2r,
                          floatW rt2i,
                          floatW cs,
                          floatW sn)