SRC/cpotri.f(3) Library Functions Manual SRC/cpotri.f(3)

SRC/cpotri.f


subroutine cpotri (uplo, n, a, lda, info)
CPOTRI

CPOTRI

Purpose:

!>
!> CPOTRI 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 CPOTRF.
!> 

Parameters

UPLO
!>          UPLO is CHARACTER*1
!>          = 'U':  Upper triangle of A is stored;
!>          = 'L':  Lower triangle of A is stored.
!> 

N

!>          N is INTEGER
!>          The order of the matrix A.  N >= 0.
!> 

A

!>          A is COMPLEX 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
!>          CPOTRF.
!>          On exit, the upper or lower triangle of the (Hermitian)
!>          inverse of A, overwriting the input factor U or L.
!> 

LDA

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

INFO

!>          INFO is INTEGER
!>          = 0:  successful exit
!>          < 0:  if INFO = -i, the i-th 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.
!> 

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 94 of file cpotri.f.

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