subroutine ctrtri (UPLO, DIAG, N, A, LDA, INFO)
subroutine ctrtri (characterUPLO, characterDIAG, integerN, complex, dimension( lda, * )A, integerLDA, integerINFO)
CTRTRI computes the inverse of a complex upper or lower triangular
This is the Level 3 BLAS version of the algorithm.
UPLO is CHARACTER*1
= ’U’: A is upper triangular;
= ’L’: A is lower triangular.
DIAG is CHARACTER*1
= ’N’: A is non-unit triangular;
= ’U’: A is unit triangular.
N is INTEGER
The order of the matrix A. N >= 0.
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 is INTEGER
The leading dimension of the array A. LDA >= max(1,N).
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.
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
Definition at line 110 of file ctrtri.f.
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