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DTRTRI(1)		 LAPACK routine (version 3.2)		     DTRTRI(1)

NAME
       DTRTRI  -  computes  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 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 ref‐
	       erenced.	  If  DIAG  = 'U', the diagonal elements of A are also
	       not referenced and are assumed to be 1.	On exit, the (triangu‐
	       lar)  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 = -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 routine (version 3.2)	 November 2008			     DTRTRI(1)
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