org.netlib.lapack
Class SLAE2

java.lang.Object
  org.netlib.lapack.SLAE2

public class SLAE2
extends java.lang.Object

SLAE2 is a simplified interface to the JLAPACK routine slae2.
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
 *  =======
 *
 *  SLAE2  computes the eigenvalues of a 2-by-2 symmetric matrix
 *     [  A   B  ]
 *     [  B   C  ].
 *  On return, RT1 is the eigenvalue of larger absolute value, and RT2
 *  is the eigenvalue of smaller absolute value.
 *
 *  Arguments
 *  =========
 *
 *  A       (input) REAL
 *          The (1,1) element of the 2-by-2 matrix.
 *
 *  B       (input) REAL
 *          The (1,2) and (2,1) elements of the 2-by-2 matrix.
 *
 *  C       (input) REAL
 *          The (2,2) element of the 2-by-2 matrix.
 *
 *  RT1     (output) REAL
 *          The eigenvalue of larger absolute value.
 *
 *  RT2     (output) REAL
 *          The eigenvalue of smaller absolute value.
 *
 *  Further Details
 *  ===============
 *
 *  RT1 is accurate to a few ulps barring over/underflow.
 *
 *  RT2 may be inaccurate if there is massive cancellation in the
 *  determinant A*C-B*B; higher precision or correctly rounded or
 *  correctly truncated arithmetic would be needed to compute RT2
 *  accurately in all cases.
 *
 *  Overflow is possible only if RT1 is within a factor of 5 of overflow.
 *  Underflow is harmless if the input data is 0 or exceeds
 *     underflow_threshold / macheps.
 *
 * =====================================================================

 *
 *     .. Parameters ..

Constructor Summary

SLAE2()

Method Summary

static void

SLAE2(float a, float b, float c, floatW rt1, floatW rt2)

Methods inherited from class java.lang.Object

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

Constructor Detail

SLAE2

public SLAE2()

Method Detail

SLAE2

public static void SLAE2(float a,
                         float b,
                         float c,
                         floatW rt1,
                         floatW rt2)