1ZPOTRI(1)                LAPACK routine (version 3.2)                ZPOTRI(1)
2
3
4

NAME

6       ZPOTRI  - computes the inverse of a complex Hermitian positive definite
7       matrix A using the Cholesky factorization A = U**H*U or A = L*L**H com‐
8       puted by ZPOTRF
9

SYNOPSIS

11       SUBROUTINE ZPOTRI( UPLO, N, A, LDA, INFO )
12
13           CHARACTER      UPLO
14
15           INTEGER        INFO, LDA, N
16
17           COMPLEX*16     A( LDA, * )
18

PURPOSE

20       ZPOTRI  computes  the  inverse of a complex Hermitian positive definite
21       matrix A using the Cholesky factorization A = U**H*U or A = L*L**H com‐
22       puted by ZPOTRF.
23

ARGUMENTS

25       UPLO    (input) CHARACTER*1
26               = 'U':  Upper triangle of A is stored;
27               = 'L':  Lower triangle of A is stored.
28
29       N       (input) INTEGER
30               The order of the matrix A.  N >= 0.
31
32       A       (input/output) COMPLEX*16 array, dimension (LDA,N)
33               On  entry,  the triangular factor U or L from the Cholesky fac‐
34               torization A = U**H*U or A = L*L**H, as computed by ZPOTRF.  On
35               exit, the upper or lower triangle of the (Hermitian) inverse of
36               A, overwriting the input factor U or L.
37
38       LDA     (input) INTEGER
39               The leading dimension of the array A.  LDA >= max(1,N).
40
41       INFO    (output) INTEGER
42               = 0:  successful exit
43               < 0:  if INFO = -i, the i-th argument had an illegal value
44               > 0:  if INFO = i, the (i,i) element of the factor U  or  L  is
45               zero, and the inverse could not be computed.
46
47
48
49 LAPACK routine (version 3.2)    November 2008                       ZPOTRI(1)
Impressum