Overview | Package | Class | Tree | Deprecated | Index | Help
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

## org.netlib.lapack
Class Slaed4

    java.lang.Object
      org.netlib.lapack.Slaed4

    public class Slaed4

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
     *  =======
     *
     *  This subroutine computes the I-th updated eigenvalue of a symmetric
     *  rank-one modification to a diagonal matrix whose elements are
     *  given in the array d, and that
     *
     *             D(i) < D(j)  for  i < j
     *
     *  and that RHO > 0.  This is arranged by the calling routine, and is
     *  no loss in generality.  The rank-one modified system is thus
     *
     *             diag( D )  +  RHO *  Z * Z_transpose.
     *
     *  where we assume the Euclidean norm of Z is 1.
     *
     *  The method consists of approximating the rational functions in the
     *  secular equation by simpler interpolating rational functions.
     *
     *  Arguments
     *  =========
     *
     *  N      (input) INTEGER
     *         The length of all arrays.
     *
     *  I      (input) INTEGER
     *         The index of the eigenvalue to be computed.  1 <= I <= N.
     *
     *  D      (input) REAL array, dimension (N)
     *         The original eigenvalues.  It is assumed that they are in
     *         order, D(I) < D(J)  for I < J.
     *
     *  Z      (input) REAL array, dimension (N)
     *         The components of the updating vector.
     *
     *  DELTA  (output) REAL array, dimension (N)
     *         If N .GT. 2, DELTA contains (D(j) - lambda_I) in its  j-th
     *         component.  If N = 1, then DELTA(1) = 1. If N = 2, see SLAED5

     *         for detail. The vector DELTA contains the information necessar
     *         to construct the eigenvectors by SLAED3 and SLAED9.
     *
     *  RHO    (input) REAL
     *         The scalar in the symmetric updating formula.
     *
     *  DLAM   (output) REAL
     *         The computed lambda_I, the I-th updated eigenvalue.
     *
     *  INFO   (output) INTEGER
     *         = 0:  successful exit
     *         > 0:  if INFO = 1, the updating process failed.
     *
     *  Internal Parameters
     *  ===================
     *
     *  Logical variable ORGATI (origin-at-i?) is used for distinguishing
     *  whether D(i) or D(i+1) is treated as the origin.
     *
     *            ORGATI = .true.    origin at i
     *            ORGATI = .false.   origin at i+1
     *
     *   Logical variable SWTCH3 (switch-for-3-poles?) is for noting
     *   if we are working with THREE poles!
     *
     *   MAXIT is the maximum number of iterations allowed for each
     *   eigenvalue.
     *
     *  Further Details
     *  ===============
     *
     *  Based on contributions by
     *     Ren-Cang Li, Computer Science Division, University of California
     *     at Berkeley, USA
     *
     *  =====================================================================
     *
     *     .. Parameters ..

Constructor Summary
`Slaed4()`

Method Summary
`static void` | `slaed4(int n, int i, float[] d, int _d_offset, float[] z, int _z_offset, float[] delta, int _delta_offset, float rho, floatW dlam, intW info)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### Slaed4

    public Slaed4()

Method Detail

### slaed4

    public static void slaed4(int n,
                              int i,
                              float[] d,
                              int _d_offset,
                              float[] z,
                              int _z_offset,
                              float[] delta,
                              int _delta_offset,
                              float rho,
                              floatW dlam,
                              intW info)

Overview | Package | Class | Tree | Deprecated | Index | Help
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD