08-18-2008
echo `cat file` | tr '[:lower:]' '[:upper:]' | tr '\t\v\f ' '\n' | sort -u | wc -l
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LEARN ABOUT REDHAT
strtri
STRTRI(l) ) STRTRI(l)
NAME
STRTRI - compute the inverse of a real upper or lower triangular matrix A
SYNOPSIS
SUBROUTINE STRTRI( UPLO, DIAG, N, A, LDA, INFO )
CHARACTER DIAG, UPLO
INTEGER INFO, LDA, N
REAL A( LDA, * )
PURPOSE
STRTRI computes the inverse of a real upper or lower triangular matrix A. This is the Level 3 BLAS version of the algorithm.
ARGUMENTS
UPLO (input) CHARACTER*1
= 'U': A is upper triangular;
= 'L': A is lower triangular.
DIAG (input) CHARACTER*1
= 'N': A is non-unit triangular;
= 'U': A is 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 tri-
angular 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 = -i, the i-th argument had an illegal value
> 0: if INFO = i, A(i,i) is exactly zero. The triangular matrix is singular and its inverse can not be computed.
LAPACK version 3.0 15 June 2000 STRTRI(l)