STRTI2 - compute the inverse of a real upper or lower tri­
       angular matrix


SYNOPSIS

       SUBROUTINE STRTI2( UPLO, DIAG, N, A, LDA, INFO )

           CHARACTER      DIAG, UPLO

           INTEGER        INFO, LDA, N

           REAL           A( LDA, * )


PURPOSE

       STRTI2 computes the inverse of a real upper or lower  tri­
       angular  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 triangular
               = 'L':  Lower triangular

       DIAG    (input) CHARACTER*1
               Specifies whether or not the matrix A is unit tri­
               angular.  = 'N':  Non-unit triangular
               = 'U':  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 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 diagonal elements of A are also not  ref­
               erenced 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

               gal value


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