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 SSYEV

    java.lang.Object
      org.netlib.lapack.SSYEV

    public class SSYEV

extends java.lang.Object

    SSYEV is a simplified interface to the JLAPACK routine ssyev.
    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
     *  =======
     *
     *  SSYEV computes all eigenvalues and, optionally, eigenvectors of a
     *  real symmetric matrix A.
     *
     *  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.
     *
     *  A       (input/output) REAL array, dimension (LDA, N)
     *          On entry, the symmetric matrix A.  If UPLO = 'U', the
     *          leading N-by-N upper triangular part of A contains the
     *          upper triangular part of the matrix A.  If UPLO = 'L',
     *          the leading N-by-N lower triangular part of A contains
     *          the lower triangular part of the matrix A.
     *          On exit, if JOBZ = 'V', then if INFO = 0, A contains the
     *          orthonormal eigenvectors of the matrix A.
     *          If JOBZ = 'N', then on exit the lower triangle (if UPLO='L')

     *          or the upper triangle (if UPLO='U') of A, including the
     *          diagonal, is destroyed.
     *
     *  LDA     (input) INTEGER
     *          The leading dimension of the array A.  LDA >= max(1,N).
     *
     *  W       (output) REAL array, dimension (N)
     *          If INFO = 0, the eigenvalues in ascending order.
     *
     *  WORK    (workspace/output) REAL array, dimension (MAX(1,LWORK))
     *          On exit, if INFO = 0, WORK(1) returns the optimal LWORK.
     *
     *  LWORK   (input) INTEGER
     *          The length of the array WORK.  LWORK >= max(1,3*N-1).
     *          For optimal efficiency, LWORK >= (NB+2)*N,
     *          where NB is the blocksize for SSYTRD returned by ILAENV.
     *
     *          If LWORK = -1, then a workspace query is assumed; the routine
     *          only calculates the optimal size of the WORK array, returns
     *          this value as the first entry of the WORK array, and no error
     *          message related to LWORK is issued by XERBLA.
     *
     *  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
`SSYEV()`

Method Summary
`static void` | `SSYEV(java.lang.String jobz, java.lang.String uplo, int n, float[][] a, float[] w, float[] work, int lwork, intW info)`

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

Constructor Detail

### SSYEV

    public SSYEV()

Method Detail

### SSYEV

    public static void SSYEV(java.lang.String jobz,
                             java.lang.String uplo,
                             int n,
                             float[][] a,
                             float[] w,
                             float[] work,
                             int lwork,
                             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