ztrtri.f - Man Page
Synopsis
Functions/Subroutines
subroutine ztrtri (UPLO, DIAG, N, A, LDA, INFO)
ZTRTRI
Function/Subroutine Documentation
subroutine ztrtri (character UPLO, character DIAG, integer N, complex*16, dimension( lda, * ) A, integer LDA, integer INFO)
ZTRTRI
Purpose:
ZTRTRI 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*16 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:
December 2016
Definition at line 111 of file ztrtri.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Referenced By
The man page ztrtri(3) is an alias of ztrtri.f(3).
Tue Nov 14 2017 Version 3.8.0 LAPACK