csytri.f (3) Linux Manual Page

csytri.f –

Synopsis

Functions/Subroutines

subroutine csytri (UPLO, N, A, LDA, IPIV, WORK, INFO)
CSYTRI

Function/Subroutine Documentation

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

CSYTRI

Purpose:

 CSYTRI computes the inverse of a complex symmetric indefinite matrix

 A using the factorization A = U*D*U**T or A = L*D*L**T computed by

 CSYTRF.

 

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**T;

 = ‘L’: Lower triangular, form is A = L*D*L**T.

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 CSYTRF.

 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 block structure of D

 as determined by CSYTRF.

WORK

 WORK is COMPLEX array, dimension (2*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 csytri.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.