CTRTRI (3) Linux Manual Page

ctrtri.f –

Synopsis

Functions/Subroutines

subroutine ctrtri (UPLO, DIAG, N, A, LDA, INFO)
CTRTRI

Function/Subroutine Documentation

subroutine ctrtri (characterUPLO, characterDIAG, integerN, complex, dimension( lda, * )A, integerLDA, integerINFO)

CTRTRI

Purpose:

 CTRTRI computes the inverse of a complex upper or lower triangular

 matrix A.

 This is the Level 3 BLAS version of the algorithm.

 

Parameters:

UPLO

 UPLO is CHARACTER*1

 = ‘U’: A is upper triangular;

 = ‘L’: A is lower triangular.

DIAG

 DIAG is CHARACTER*1

 = ‘N’: A is non-unit triangular;

 = ‘U’: A is unit triangular.

N

 N is INTEGER

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

A

 A is 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

 LDA is INTEGER

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

INFO

 INFO is INTEGER

 = 0: successful exit

 < 0: if INFO = -i, the i-th argument had an illegal value

 > 0: if INFO = i, A(i,i) is exactly zero. The triangular

 matrix is singular and its inverse can not be computed.

 

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

November 2011

Definition at line 110 of file ctrtri.f.

Author

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