ZTRTI2(1) | LAPACK routine (version 3.2) | ZTRTI2(1) |
NAME¶
ZTRTI2 - computes the inverse of a complex upper or lower triangular matrix
SYNOPSIS¶
- SUBROUTINE ZTRTI2(
- UPLO, DIAG, N, A, LDA, INFO )
CHARACTER DIAG, UPLO INTEGER INFO, LDA, N COMPLEX*16 A( LDA, * )
PURPOSE¶
ZTRTI2 computes the inverse of a complex upper or lower triangular matrix. This is the Level 2 BLAS version of the algorithm.
ARGUMENTS¶
- 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).
- INFO (output) INTEGER
- = 0: successful exit
< 0: if INFO = -k, the k-th argument had an illegal value
November 2008 | LAPACK routine (version 3.2) |