org.netlib.lapack
Class Dstev

java.lang.Object
  org.netlib.lapack.Dstev

public class Dstev
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
 *  =======
 *
 *  DSTEV 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) DOUBLE PRECISION 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) DOUBLE PRECISION 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) DOUBLE PRECISION 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) DOUBLE PRECISION 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

Dstev()

Method Summary

static void

dstev(java.lang.String jobz, int n, double[] d, int _d_offset, double[] e, int _e_offset, double[] z, int _z_offset, int ldz, double[] work, int _work_offset, intW info)

Methods inherited from class java.lang.Object

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

Constructor Detail

Dstev

public Dstev()

Method Detail

dstev

public static void dstev(java.lang.String jobz,
                         int n,
                         double[] d,
                         int _d_offset,
                         double[] e,
                         int _e_offset,
                         double[] z,
                         int _z_offset,
                         int ldz,
                         double[] work,
                         int _work_offset,
                         intW info)