ztrti2(3P) Sun Performance Library ztrti2(3P)NAMEztrti2 - compute the inverse of a complex upper or lower triangular
matrix
SYNOPSIS
SUBROUTINE ZTRTI2(UPLO, DIAG, N, A, LDA, INFO)
CHARACTER * 1 UPLO, DIAG
DOUBLE COMPLEX A(LDA,*)
INTEGER N, LDA, INFO
SUBROUTINE ZTRTI2_64(UPLO, DIAG, N, A, LDA, INFO)
CHARACTER * 1 UPLO, DIAG
DOUBLE COMPLEX A(LDA,*)
INTEGER*8 N, LDA, INFO
F95 INTERFACE
SUBROUTINE TRTI2(UPLO, DIAG, [N], A, [LDA], [INFO])
CHARACTER(LEN=1) :: UPLO, DIAG
COMPLEX(8), DIMENSION(:,:) :: A
INTEGER :: N, LDA, INFO
SUBROUTINE TRTI2_64(UPLO, DIAG, [N], A, [LDA], [INFO])
CHARACTER(LEN=1) :: UPLO, DIAG
COMPLEX(8), DIMENSION(:,:) :: A
INTEGER(8) :: N, LDA, INFO
C INTERFACE
#include <sunperf.h>
void ztrti2(char uplo, char diag, int n, doublecomplex *a, int lda, int
*info);
void ztrti2_64(char uplo, char diag, long n, doublecomplex *a, long
lda, long *info);
PURPOSEztrti2 computes the inverse of a complex upper or lower triangular
matrix.
This is the Level 2 BLAS version of the algorithm.
ARGUMENTS
UPLO (input)
Specifies whether the matrix A is upper or lower triangular.
= 'U': Upper triangular
= 'L': Lower triangular
DIAG (input)
Specifies whether or not the matrix A is unit triangular. =
'N': Non-unit triangular
= 'U': Unit triangular
N (input) The order of the matrix A. N >= 0.
A (input/output)
On entry, the triangular matrix A. If UPLO = 'U', the lead‐
ing 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 (input)
The leading dimension of the array A. LDA >= max(1,N).
INFO (output)
= 0: successful exit
< 0: if INFO = -k, the k-th argument had an illegal value
6 Mar 2009 ztrti2(3P)