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IRIX 6.2 Development Libraries
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ctrti2.z
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ctrti2
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1996-03-14
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133 lines
CCCCTTTTRRRRTTTTIIII2222((((3333FFFF)))) CCCCTTTTRRRRTTTTIIII2222((((3333FFFF))))
NNNNAAAAMMMMEEEE
CTRTI2 - compute the inverse of a complex upper or lower triangular
matrix
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
SUBROUTINE CTRTI2( UPLO, DIAG, N, A, LDA, INFO )
CHARACTER DIAG, UPLO
INTEGER INFO, LDA, N
COMPLEX A( LDA, * )
PPPPUUUURRRRPPPPOOOOSSSSEEEE
CTRTI2 computes the inverse of a complex upper or lower triangular
matrix.
This is the Level 2 BLAS version of the algorithm.
AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
UPLO (input) CHARACTER*1
Specifies whether the matrix A is upper or lower triangular. =
'U': Upper triangular
= 'L': Lower triangular
DIAG (input) CHARACTER*1
Specifies whether or not the matrix A is unit triangular. = 'N':
Non-unit triangular
= 'U': Unit triangular
N (input) INTEGER
The order of the matrix A. N >= 0.
A (input/output) 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 (input) INTEGER
The leading dimension of the array A. LDA >= max(1,N).
PPPPaaaaggggeeee 1111
CCCCTTTTRRRRTTTTIIII2222((((3333FFFF)))) CCCCTTTTRRRRTTTTIIII2222((((3333FFFF))))
INFO (output) INTEGER
= 0: successful exit
< 0: if INFO = -k, the k-th argument had an illegal value
PPPPaaaaggggeeee 2222