function [ a, b, c ] = r83v_indicator ( m, n )

%*****************************************************************************80
%
%% R83V_INDICATOR sets up an R83V indicator matrix.
%
%  Discussion:
%
%    The R83V storage format is used for a tridiagonal matrix.
%    The subdiagonal is in A(min(M-1,N)).
%    The diagonal is in B(min(M,N)).
%    The superdiagonal is in C(min(M,N-1)).
%
%  Example:
%
%    An R83V matrix of order 3x5 would be stored:
%
%      B1  C1  **  **  **
%      A1  B2  C2  **  **
%      **  A2  B3  C3  **
%
%    An R83 matrix of order 5x5 would be stored:
%
%      B1  C1  **  **  **
%      A1  B2  C2  **  **
%      **  A2  B3  C3  **
%      **  **  A3  B4  C4
%      **  **  **  A4  B5
%
%    An R83 matrix of order 5x3 would be stored:
%
%      B1  C1  **
%      A1  B2  C2
%      **  A2  B3
%      **  **  A3
%      **  **  **
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    31 January 2016
%
%  Author:
%
%    John Burkardt
%
%  Parameters:
%
%    Input, integer M, N, the order of the matrix.
%
%    Output, real A(min(M-1,N)), B(min(M,N)), C(min(M,N-1)), the R83V matrix.
%
  a = zeros ( min ( m - 1, n     ), 1 );
  b = zeros ( min ( m,     n     ), 1 );
  c = zeros ( min ( m,     n - 1 ), 1 );

  fac = 10 ^ ( i4_log_10 ( n ) + 1 );

  for i = 1 : min ( m - 1, n )
    a(i) = ( fac * ( i + 1 ) + i );
  end

  for i = 1 : min ( m, n )
    b(i) = ( fac * i + i );
  end

  for i = 1 : min ( m, n - 1 )
    c(i) = ( fac * i + i + 1 );
  end

  return
end
