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IRIX 6.2 Development Libraries
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ztrti2.z
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ztrti2
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1996-03-14
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133 lines
ZZZZTTTTRRRRTTTTIIII2222((((3333FFFF)))) ZZZZTTTTRRRRTTTTIIII2222((((3333FFFF))))
NNNNAAAAMMMMEEEE
ZTRTI2 - compute the inverse of a complex upper or lower triangular
matrix
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
SUBROUTINE ZTRTI2( UPLO, DIAG, N, A, LDA, INFO )
CHARACTER DIAG, UPLO
INTEGER INFO, LDA, N
COMPLEX*16 A( LDA, * )
PPPPUUUURRRRPPPPOOOOSSSSEEEE
ZTRTI2 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*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 (input) INTEGER
The leading dimension of the array A. LDA >= max(1,N).
PPPPaaaaggggeeee 1111
ZZZZTTTTRRRRTTTTIIII2222((((3333FFFF)))) ZZZZTTTTRRRRTTTTIIII2222((((3333FFFF))))
INFO (output) INTEGER
= 0: successful exit
< 0: if INFO = -k, the k-th argument had an illegal value
PPPPaaaaggggeeee 2222