org.netlib.lapack
Class SSTEV

java.lang.Object
  org.netlib.lapack.SSTEV

public class SSTEV
extends java.lang.Object

SSTEV is a simplified interface to the JLAPACK routine sstev.
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
 *  =======
 *
 *  SSTEV computes all eigenvalues and, optionally, eigenvectors of a
 *  real symmetric tridiagonal matrix A.
 *
 *  Arguments
 *  =========
 *
 *  JOBZ    (input) CHARACTER*1
 *          = 'N':  Compute eigenvalues only;
 *          = 'V':  Compute eigenvalues and eigenvectors.
 *
 *  N       (input) INTEGER
 *          The order of the matrix.  N >= 0.
 *
 *  D       (input/output) REAL array, dimension (N)
 *          On entry, the n diagonal elements of the tridiagonal matrix
 *          A.
 *          On exit, if INFO = 0, the eigenvalues in ascending order.
 *
 *  E       (input/output) REAL array, dimension (N)
 *          On entry, the (n-1) subdiagonal elements of the tridiagonal
 *          matrix A, stored in elements 1 to N-1 of E; E(N) need not
 *          be set, but is used by the routine.
 *          On exit, the contents of E are destroyed.
 *
 *  Z       (output) REAL array, dimension (LDZ, N)
 *          If JOBZ = 'V', then if INFO = 0, Z contains the orthonormal
 *          eigenvectors of the matrix A, with the i-th column of Z
 *          holding the eigenvector associated with D(i).
 *          If JOBZ = 'N', then Z is not referenced.
 *
 *  LDZ     (input) INTEGER
 *          The leading dimension of the array Z.  LDZ >= 1, and if
 *          JOBZ = 'V', LDZ >= max(1,N).
 *
 *  WORK    (workspace) REAL array, dimension (max(1,2*N-2))
 *          If JOBZ = 'N', WORK is not referenced.
 *
 *  INFO    (output) INTEGER
 *          = 0:  successful exit
 *          < 0:  if INFO = -i, the i-th argument had an illegal value
 *          > 0:  if INFO = i, the algorithm failed to converge; i
 *                off-diagonal elements of E did not converge to zero.
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

SSTEV()

Method Summary

static void

SSTEV(java.lang.String jobz, int n, float[] d, float[] e, float[][] z, float[] work, intW info)

Methods inherited from class java.lang.Object

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

Constructor Detail

SSTEV

public SSTEV()

Method Detail

SSTEV

public static void SSTEV(java.lang.String jobz,
                         int n,
                         float[] d,
                         float[] e,
                         float[][] z,
                         float[] work,
                         intW info)