[ новости /+++ | форум | теги | ]

NAME
     zpotri - compute the inverse of a complex Hermitian positive
     definite  matrix  A  using  the  Cholesky  factorization A =
     U**H*U or A = L*L**H computed by ZPOTRF

SYNOPSIS
     SUBROUTINE ZPOTRI( UPLO, N, A, LDA, INFO )

     CHARACTER UPLO

     INTEGER INFO, LDA, N

     COMPLEX*16 A( LDA, * )



     #include <sunperf.h>

     void zpotri(char uplo, int n, doublecomplex  *za,  int  lda,
               int *info) ;

PURPOSE
     ZPOTRI computes the inverse of a complex Hermitian  positive
     definite  matrix  A  using  the  Cholesky  factorization A =
     U**H*U or A = L*L**H computed by ZPOTRF.


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.

     A         (input/output) COMPLEX*16 array, dimension (LDA,N)
               On entry, the triangular factor U or  L  from  the
               Cholesky  factorization  A = U**H*U or A = L*L**H,
               as computed by ZPOTRF.   On  exit,  the  upper  or
               lower  triangle  of  the (Hermitian) inverse of A,
               overwriting the input factor U or L.

     LDA       (input) INTEGER
               The leading dimension of  the  array  A.   LDA  >=
               max(1,N).

     INFO      (output) INTEGER
               = 0:  successful exit
               < 0:  if INFO = -i, the i-th argument had an ille-
               gal value
               > 0:  if INFO = i, the (i,i) element of the factor
               U  or  L  is  zero,  and  the inverse could not be
               computed.

Партнёры:

Хостинг: