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strti2
Langue: en
Version: 324750 (ubuntu - 08/07/09)
Section: 3 (Bibliothèques de fonctions)
NAME
STRTI2 - compute the inverse of a real upper or lower triangular matrixSYNOPSIS
- SUBROUTINE STRTI2(
- UPLO, DIAG, N, A, LDA, INFO )
- CHARACTER DIAG, UPLO
- INTEGER INFO, LDA, N
- REAL A( LDA, * )
PURPOSE
STRTI2 computes the inverse of a real 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) REAL 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
Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre