org.netlib.lapack
Class Slae2

java.lang.Object
  org.netlib.lapack.Slae2

public class Slae2
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
 *  =======
 *
 *  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)