
ZPOTRI(l) ) ZPOTRI(l)
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, * )
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 ith argument had an illegal value
> 0: if INFO = i, the (i,i) element of the factor U or L is zero, and the inverse
could not be computed.
LAPACK version 3.0 15 June 2000 ZPOTRI(l) 
