org.netlib.lapack
Class SPPCON

java.lang.Object
  org.netlib.lapack.SPPCON

public class SPPCON
extends java.lang.Object

SPPCON is a simplified interface to the JLAPACK routine sppcon.
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
 *  =======
 *
 *  SPPCON estimates the reciprocal of the condition number (in the
 *  1-norm) of a real symmetric positive definite packed matrix using
 *  the Cholesky factorization A = U**T*U or A = L*L**T computed by
 *  SPPTRF.
 *
 *  An estimate is obtained for norm(inv(A)), and the reciprocal of the
 *  condition number is computed as RCOND = 1 / (ANORM * norm(inv(A))).
 *
 *  Arguments
 *  =========
 *
 *  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) REAL array, dimension (N*(N+1)/2)
 *          The triangular factor U or L from the Cholesky factorization

 *          A = U**T*U or A = L*L**T, packed columnwise in a linear
 *          array.  The j-th column of U or L is stored in the array AP
 *          as follows:
 *          if UPLO = 'U', AP(i + (j-1)*j/2) = U(i,j) for 1<=i<=j;
 *          if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = L(i,j) for j<=i<=n.
 *
 *  ANORM   (input) REAL
 *          The 1-norm (or infinity-norm) of the symmetric matrix A.
 *
 *  RCOND   (output) REAL
 *          The reciprocal of the condition number of the matrix A,
 *          computed as RCOND = 1/(ANORM * AINVNM), where AINVNM is an
 *          estimate of the 1-norm of inv(A) computed in this routine.
 *
 *  WORK    (workspace) REAL array, dimension (3*N)
 *
 *  IWORK   (workspace) INTEGER array, dimension (N)
 *
 *  INFO    (output) INTEGER
 *          = 0:  successful exit
 *          < 0:  if INFO = -i, the i-th argument had an illegal value
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

SPPCON()

Method Summary

static void

SPPCON(java.lang.String uplo, int n, float[] ap, float anorm, floatW rcond, float[] work, int[] iwork, intW info)

Methods inherited from class java.lang.Object

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

Constructor Detail

SPPCON

public SPPCON()

Method Detail

SPPCON

public static void SPPCON(java.lang.String uplo,
                          int n,
                          float[] ap,
                          float anorm,
                          floatW rcond,
                          float[] work,
                          int[] iwork,
                          intW info)