ctrti2-f(3)

ctrti2.f –

Synopsis

Functions/Subroutines

subroutine ctrti2 (UPLO, DIAG, N, A, LDA, INFO)
CTRTI2 computes the inverse of a triangular matrix (unblocked algorithm).

Function/Subroutine Documentation

subroutine ctrti2 (characterUPLO, characterDIAG, integerN, complex, dimension( lda, * )A, integerLDA, integerINFO)

CTRTI2 computes the inverse of a triangular matrix (unblocked algorithm).

Purpose:

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

Parameters:

UPLO

 UPLO is CHARACTER*1
 Specifies whether the matrix A is upper or lower triangular.
 = 'U': Upper triangular
 = 'L': Lower triangular

DIAG

 DIAG is CHARACTER*1
 Specifies whether or not the matrix A is unit triangular.
 = 'N': Non-unit triangular
 = 'U': Unit triangular

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

 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 = -k, the k-th argument had an illegal value

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

September 2012

Definition at line 111 of file ctrti2.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.