CPOTRI(1) | LAPACK routine (version 3.2) | CPOTRI(1) |
NAME¶
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
SYNOPSIS¶
- SUBROUTINE CPOTRI(
- UPLO, N, A, LDA, INFO )
CHARACTER UPLO INTEGER INFO, LDA, N COMPLEX A( LDA, * )
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.
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 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 (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 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.
November 2008 | LAPACK routine (version 3.2) |