  Quick Navigator

 Search Site Miscellaneous Server Agreement Year 2038 Credits   ztrti2.f(3) LAPACK ztrti2.f(3)

ztrti2.f -

# SYNOPSIS

## Functions/Subroutines

subroutine ztrti2 (UPLO, DIAG, N, A, LDA, INFO)

ZTRTI2 computes the inverse of a triangular matrix (unblocked algorithm).

# Function/Subroutine Documentation

## subroutine ztrti2 (characterUPLO, characterDIAG, integerN, complex*16, dimension( lda, * )A, integerLDA, integerINFO)

ZTRTI2 computes the inverse of a triangular matrix (unblocked algorithm).
Purpose:
``` ZTRTI2 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*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 = -k, the k-th argument had an illegal value
```
Author:
Univ. of Tennessee
Univ. of California Berkeley
NAG Ltd.
Date:
September 2012
Definition at line 111 of file ztrti2.f.

# Author

Generated automatically by Doxygen for LAPACK from the source code.
 Sat Nov 16 2013 Version 3.4.2

Search for    or go to Top of page |  Section 3 |  Main Index Visit the GSP FreeBSD Man Page Interface.
Output converted with ManDoc.