org.netlib.lapack
Class SDISNA

java.lang.Object
  org.netlib.lapack.SDISNA

public class SDISNA
extends java.lang.Object

SDISNA is a simplified interface to the JLAPACK routine sdisna.
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
 *  =======
 *
 *  SDISNA computes the reciprocal condition numbers for the eigenvectors
 *  of a real symmetric or complex Hermitian matrix or for the left or
 *  right singular vectors of a general m-by-n matrix. The reciprocal
 *  condition number is the 'gap' between the corresponding eigenvalue or
 *  singular value and the nearest other one.
 *
 *  The bound on the error, measured by angle in radians, in the I-th
 *  computed vector is given by
 *
 *         SLAMCH( 'E' ) * ( ANORM / SEP( I ) )
 *
 *  where ANORM = 2-norm(A) = max( abs( D(j) ) ).  SEP(I) is not allowed

 *  to be smaller than SLAMCH( 'E' )*ANORM in order to limit the size of

 *  the error bound.
 *
 *  SDISNA may also be used to compute error bounds for eigenvectors of
 *  the generalized symmetric definite eigenproblem.
 *
 *  Arguments
 *  =========
 *
 *  JOB     (input) CHARACTER*1
 *          Specifies for which problem the reciprocal condition numbers

 *          should be computed:
 *          = 'E':  the eigenvectors of a symmetric/Hermitian matrix;
 *          = 'L':  the left singular vectors of a general matrix;
 *          = 'R':  the right singular vectors of a general matrix.
 *
 *  M       (input) INTEGER
 *          The number of rows of the matrix. M >= 0.
 *
 *  N       (input) INTEGER
 *          If JOB = 'L' or 'R', the number of columns of the matrix,
 *          in which case N >= 0. Ignored if JOB = 'E'.
 *
 *  D       (input) REAL array, dimension (M) if JOB = 'E'
 *                              dimension (min(M,N)) if JOB = 'L' or 'R'

 *          The eigenvalues (if JOB = 'E') or singular values (if JOB =
 *          'L' or 'R') of the matrix, in either increasing or decreasing
 *          order. If singular values, they must be non-negative.
 *
 *  SEP     (output) REAL array, dimension (M) if JOB = 'E'
 *                               dimension (min(M,N)) if JOB = 'L' or 'R'
 *          The reciprocal condition numbers of the vectors.
 *
 *  INFO    (output) INTEGER
 *          = 0:  successful exit.
 *          < 0:  if INFO = -i, the i-th argument had an illegal value.
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

SDISNA()

Method Summary

static void

SDISNA(java.lang.String job, int m, int n, float[] d, float[] sep, intW info)

Methods inherited from class java.lang.Object

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

Constructor Detail

SDISNA

public SDISNA()

Method Detail

SDISNA

public static void SDISNA(java.lang.String job,
                          int m,
                          int n,
                          float[] d,
                          float[] sep,
                          intW info)