ctrtri(3P) Sun Performance Library ctrtri(3P)NAMEctrtri - compute the inverse of a complex upper or lower triangular
matrix A
SYNOPSIS
SUBROUTINE CTRTRI(UPLO, DIAG, N, A, LDA, INFO)
CHARACTER * 1 UPLO, DIAG
COMPLEX A(LDA,*)
INTEGER N, LDA, INFO
SUBROUTINE CTRTRI_64(UPLO, DIAG, N, A, LDA, INFO)
CHARACTER * 1 UPLO, DIAG
COMPLEX A(LDA,*)
INTEGER*8 N, LDA, INFO
F95 INTERFACE
SUBROUTINE TRTRI(UPLO, DIAG, [N], A, [LDA], [INFO])
CHARACTER(LEN=1) :: UPLO, DIAG
COMPLEX, DIMENSION(:,:) :: A
INTEGER :: N, LDA, INFO
SUBROUTINE TRTRI_64(UPLO, DIAG, [N], A, [LDA], [INFO])
CHARACTER(LEN=1) :: UPLO, DIAG
COMPLEX, DIMENSION(:,:) :: A
INTEGER(8) :: N, LDA, INFO
C INTERFACE
#include <sunperf.h>
void ctrtri(char uplo, char diag, int n, complex *a, int lda, int
*info);
void ctrtri_64(char uplo, char diag, long n, complex *a, long lda, long
*info);
PURPOSEctrtri computes the inverse of a complex upper or lower triangular
matrix A.
This is the Level 3 BLAS version of the algorithm.
ARGUMENTS
UPLO (input)
= 'U': A is upper triangular;
= 'L': A is lower triangular.
DIAG (input)
= 'N': A is non-unit triangular;
= 'U': A is 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 = -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.
6 Mar 2009 ctrtri(3P)
