zhetri2x.f - Man Page
SRC/zhetri2x.f
Synopsis
Functions/Subroutines
subroutine zhetri2x (uplo, n, a, lda, ipiv, work, nb, info)
ZHETRI2X
Function/Subroutine Documentation
subroutine zhetri2x (character uplo, integer n, complex*16, dimension( lda, * ) a, integer lda, integer, dimension( * ) ipiv, complex*16, dimension( n+nb+1,* ) work, integer nb, integer info)
ZHETRI2X
Purpose:
ZHETRI2X computes the inverse of a COMPLEX*16 Hermitian indefinite matrix A using the factorization A = U*D*U**H or A = L*D*L**H computed by ZHETRF.
- Parameters
UPLO
UPLO is CHARACTER*1 Specifies whether the details of the factorization are stored as an upper or lower triangular matrix. = 'U': Upper triangular, form is A = U*D*U**H; = 'L': Lower triangular, form is A = L*D*L**H.
N
N is INTEGER The order of the matrix A. N >= 0.
A
A is COMPLEX*16 array, dimension (LDA,N) On entry, the NNB diagonal matrix D and the multipliers used to obtain the factor U or L as computed by ZHETRF. On exit, if INFO = 0, the (symmetric) inverse of the original matrix. If UPLO = 'U', the upper triangular part of the inverse is formed and the part of A below the diagonal is not referenced; if UPLO = 'L' the lower triangular part of the inverse is formed and the part of A above the diagonal is not referenced.
LDA
LDA is INTEGER The leading dimension of the array A. LDA >= max(1,N).
IPIV
IPIV is INTEGER array, dimension (N) Details of the interchanges and the NNB structure of D as determined by ZHETRF.
WORK
WORK is COMPLEX*16 array, dimension (N+NB+1,NB+3)
NB
NB is INTEGER Block size
INFO
INFO is INTEGER = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value > 0: if INFO = i, D(i,i) = 0; the matrix is singular and its inverse could not be computed.
- Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Definition at line 119 of file zhetri2x.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Referenced By
The man page zhetri2x(3) is an alias of zhetri2x.f(3).
Tue Nov 28 2023 12:08:42 Version 3.12.0 LAPACK