ctrti2.f3
Usage
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 (character uplo, character diag, integer n, complex, dimension( lda, * ) a, integer lda, integer info)
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
!> 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 = -k, the k-th argument had an illegal value !>
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Definition at line 109 of file ctrti2.f.
Releases
4 releases since Debian 7 (Wheezy); the text changed 3 times.