function A = digraph_adj_example_abcd ( )

%*****************************************************************************80
%
%% digraph_adj_example_abcd() returns the adjacency matrix for a 4-node example.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    01 March 2020
%
%  Author:
%
%    John Burkardt
%
%  Output:
%
%    integer A(4,4), the adjacency matrix.
%
  node_num = 4;

  A = [ ...
     0, 1, 0, 0; ...
     0, 0, 1, 0; ...
     1, 0, 0, 1; ...
     1, 0, 0, 0 ];

  return
end
