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Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :

ISBN : 978-2-7460-9712-4
EAN : 9782746097124
(Editions ENI)

GNU/Linux	CentOS 4.8	i386
	ctrti2(l)

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CTRTI2

NAME
SYNOPSIS
PURPOSE
ARGUMENTS

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NAME

CTRTI2 - compute the inverse of a complex upper or lower triangular matrix

SYNOPSIS

	SUBROUTINE CTRTI2(		UPLO, DIAG, N, A, LDA, INFO )
	CHARACTER		DIAG, UPLO
	INTEGER		INFO, LDA, N
	COMPLEX		A( LDA, * )

PURPOSE

CTRTI2 computes the inverse of a complex upper or lower triangular matrix. This is the Level 2 BLAS version of the algorithm.

ARGUMENTS

UPLO (input) CHARACTER*1

Specifies whether the matrix A is upper or lower triangular. = ’U’: Upper triangular
= ’L’: Lower triangular

DIAG (input) CHARACTER*1

Specifies whether or not the matrix A is unit triangular. = ’N’: Non-unit triangular
= ’U’: Unit triangular

N (input) INTEGER

The order of the matrix A. N >= 0.

A (input/output) COMPLEX array, dimension (LDA,N)

On entry, the triangular matrix A. If UPLO = ’U’, the leading n by n upper triangular part of the array A contains the upper triangular matrix, and the strictly lower triangular part of A is not referenced. If UPLO = ’L’, the leading n by n lower triangular part of the array A contains the lower triangular matrix, and the strictly upper triangular part of A is not referenced. If DIAG = ’U’, the diagonal elements of A are also not referenced and are assumed to be 1.

On exit, the (triangular) inverse of the original matrix, in the same storage format.

LDA (input) INTEGER

The leading dimension of the array A. LDA >= max(1,N).

INFO (output) INTEGER

= 0: successful exit
< 0: if INFO = -k, the k-th argument had an illegal value

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ctrti2(l)