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RedHat 9 (Linux i386) - man page for dtrti2 (redhat section l)

DTRTI2(l)					)					DTRTI2(l)

NAME
       DTRTI2 - compute the inverse of a real upper or lower triangular matrix

SYNOPSIS
       SUBROUTINE DTRTI2( UPLO, DIAG, N, A, LDA, INFO )

	   CHARACTER	  DIAG, UPLO

	   INTEGER	  INFO, LDA, N

	   DOUBLE	  PRECISION A( LDA, * )

PURPOSE
       DTRTI2 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 trian-
	       gular
	       = 'L':  Lower triangular

       DIAG    (input) CHARACTER*1
	       Specifies whether or not the matrix A is unit triangular.  = 'N':  Non-unit trian-
	       gular
	       = 'U':  Unit triangular

       N       (input) INTEGER
	       The order of the matrix A.  N >= 0.

       A       (input/output) DOUBLE PRECISION array, dimension (LDA,N)
	       On entry, the triangular matrix A.  If UPLO = 'U', the leading n by n upper trian-
	       gular  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  diago-
	       nal 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 for-
	       mat.

       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

LAPACK version 3.0			   15 June 2000 				DTRTI2(l)


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