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

DTRTRI(l)					)					DTRTRI(l)

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

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

	   CHARACTER	  DIAG, UPLO

	   INTEGER	  INFO, LDA, N

	   DOUBLE	  PRECISION A( LDA, * )

PURPOSE
       DTRTRI  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) 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 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 				DTRTRI(l)


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