dtrtri man page on Scientific

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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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