org.netlib.lapack
Class Sspev

java.lang.Object
  org.netlib.lapack.Sspev

public class Sspev
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
 *  =======
 *
 *  SSPEV computes all the eigenvalues and, optionally, eigenvectors of a
 *  real symmetric matrix A in packed storage.
 *
 *  Arguments
 *  =========
 *
 *  JOBZ    (input) CHARACTER*1
 *          = 'N':  Compute eigenvalues only;
 *          = 'V':  Compute eigenvalues and eigenvectors.
 *
 *  UPLO    (input) CHARACTER*1
 *          = 'U':  Upper triangle of A is stored;
 *          = 'L':  Lower triangle of A is stored.
 *
 *  N       (input) INTEGER
 *          The order of the matrix A.  N >= 0.
 *
 *  AP      (input/output) REAL array, dimension (N*(N+1)/2)
 *          On entry, the upper or lower triangle of the symmetric matrix
 *          A, packed columnwise in a linear array.  The j-th column of A
 *          is stored in the array AP as follows:
 *          if UPLO = 'U', AP(i + (j-1)*j/2) = A(i,j) for 1<=i<=j;
 *          if UPLO = 'L', AP(i + (j-1)*(2*n-j)/2) = A(i,j) for j<=i<=n.

 *
 *          On exit, AP is overwritten by values generated during the
 *          reduction to tridiagonal form.  If UPLO = 'U', the diagonal
 *          and first superdiagonal of the tridiagonal matrix T overwrite
 *          the corresponding elements of A, and if UPLO = 'L', the
 *          diagonal and first subdiagonal of T overwrite the
 *          corresponding elements of A.
 *
 *  W       (output) REAL array, dimension (N)
 *          If INFO = 0, the eigenvalues in ascending order.
 *
 *  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 W(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 (3*N)
 *
 *  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 an intermediate tridiagonal
 *                form did not converge to zero.
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

Sspev()

Method Summary

static void

sspev(java.lang.String jobz, java.lang.String uplo, int n, float[] ap, int _ap_offset, float[] w, int _w_offset, float[] z, int _z_offset, int ldz, float[] 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

Sspev

public Sspev()

Method Detail

sspev

public static void sspev(java.lang.String jobz,
                         java.lang.String uplo,
                         int n,
                         float[] ap,
                         int _ap_offset,
                         float[] w,
                         int _w_offset,
                         float[] z,
                         int _z_offset,
                         int ldz,
                         float[] work,
                         int _work_offset,
                         intW info)