chetri-f(3)

chetri.f –

Synopsis

Functions/Subroutines

subroutine chetri (UPLO, N, A, LDA, IPIV, WORK, INFO)
CHETRI

Function/Subroutine Documentation

subroutine chetri (characterUPLO, integerN, complex, dimension( lda, * )A, integerLDA, integer, dimension( * )IPIV, complex, dimension( * )WORK, integerINFO)

CHETRI

Purpose:

 CHETRI computes the inverse of a complex Hermitian indefinite matrix
 A using the factorization A = U*D*U**H or A = L*D*L**H computed by
 CHETRF.

 

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 array, dimension (LDA,N)
 On entry, the block diagonal matrix D and the multipliers
 used to obtain the factor U or L as computed by CHETRF.
 On exit, if INFO = 0, the (Hermitian) 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 block structure of D
 as determined by CHETRF.

WORK

 WORK is COMPLEX array, dimension (N)

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.

Date:

November 2011

Definition at line 115 of file chetri.f.

Author

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