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- CTRTI2 - compute the inverse of a complex upper or lower triangular
- matrix
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- SUBROUTINE CTRTI2( UPLO, DIAG, N, A, LDA, INFO )
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- CHARACTER DIAG, UPLO
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- INTEGER INFO, LDA, N
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- COMPLEX A( LDA, * )
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- CTRTI2 computes the inverse of a complex upper or lower triangular
- matrix.
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- This is the Level 2 BLAS version of the algorithm.
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- UPLO (input) CHARACTER*1
- Specifies whether the matrix A is upper or lower triangular. =
- 'U': Upper triangular
- = 'L': Lower triangular
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- DIAG (input) CHARACTER*1
- Specifies whether or not the matrix A is unit triangular. = 'N':
- Non-unit triangular
- = 'U': Unit triangular
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- N (input) INTEGER
- The order of the matrix A. N >= 0.
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- 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.
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- On exit, the (triangular) inverse of the original matrix, in the
- same storage format.
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- LDA (input) INTEGER
- The leading dimension of the array A. LDA >= max(1,N).
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- INFO (output) INTEGER
- = 0: successful exit
- < 0: if INFO = -k, the k-th argument had an illegal value
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