dsytri_rook (3) Linux Manual Page

dsytri_rook.f –

Synopsis

Functions/Subroutines

subroutine dsytri_rook (UPLO, N, A, LDA, IPIV, WORK, INFO)
DSYTRI_ROOK

Function/Subroutine Documentation

subroutine dsytri_rook (characterUPLO, integerN, double precision, dimension( lda, * )A, integerLDA, integer, dimension( * )IPIV, double precision, dimension( * )WORK, integerINFO)

DSYTRI_ROOK

Purpose:

 DSYTRI_ROOK computes the inverse of a real symmetric

 matrix A using the factorization A = U*D*U**T or A = L*D*L**T

 computed by DSYTRF_ROOK.

 

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 DOUBLE PRECISION 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 DSYTRF_ROOK.

 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 DSYTRF_ROOK.

WORK

 WORK is DOUBLE PRECISION 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:

April 2012

Contributors:

 April 2012, Igor Kozachenko,

 Computer Science Division,

 University of California, Berkeley

 September 2007, Sven Hammarling, Nicholas J. Higham, Craig Lucas,

 School of Mathematics,

 University of Manchester

 

Definition at line 130 of file dsytri_rook.f.

Author

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