CTRTI2  -  compute the inverse of a complex upper or lower
       triangular matrix


SYNOPSIS

       SUBROUTINE CTRTI2( UPLO, DIAG, N, A, LDA, INFO )

           CHARACTER      DIAG, UPLO

           INTEGER        INFO, LDA, N

           COMPLEX        A( LDA, * )


PURPOSE

       CTRTI2 computes the inverse of a complex  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 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) COMPLEX 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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