ctrtri-f(3)

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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