function discrete_sample_test ( )

%*****************************************************************************80
%
%% DISCRETE_SAMPLE_TEST() tests DISCRETE_MEAN(), DISCRETE_SAMPLE(), DISCRETE_VARIANCE().
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    15 April 2009
%
%  Author:
%
%    John Burkardt
%
  a = 6;
  nsample = 1000;

  fprintf ( 1, '\n' );
  fprintf ( 1, 'DISCRETE_SAMPLE_TEST():\n' );
  fprintf ( 1, '  DISCRETE_MEAN() computes the Discrete mean;\n' );
  fprintf ( 1, '  DISCRETE_SAMPLE() samples the Discrete distribution;\n' );
  fprintf ( 1, '  DISCRETE_VARIANCE() computes the Discrete variance.\n' );

  b(1:6) = [ 1.0, 2.0, 6.0, 2.0, 4.0, 1.0 ];

  check = discrete_check ( a, b );

  if ( ~ check );
    fprintf ( 1, '\n' );
    fprintf ( 1, 'DISCRETE_SAMPLE_TEST - Fatal error!\n' );
    fprintf ( 1, '  The parameters are not legal.\n' );
    return
  end

  x_mean = discrete_mean ( a, b );
  x_var = discrete_variance ( a, b );

  fprintf ( 1, '\n' );
  fprintf ( 1, '  PDF parameter A =             %14g\n', a );
  fprintf ( 1, '  PDF parameters B:\n' );
  for j = 1 : a
    fprintf ( 1, '  %6d  %14g\n', j, b(j) );
  end
  fprintf ( 1, '  PDF mean =                    %14g\n', x_mean );
  fprintf ( 1, '  PDF variance =                %14g\n', x_var );

  x = zeros ( nsample, 1 );  
  for i = 1 : nsample
    x(i) = discrete_sample ( a, b );
  end

  x_mean = mean ( x );
  x_var = var ( x );
  x_max = max ( x );
  x_min = min ( x );

  fprintf ( 1, '\n' );
  fprintf ( 1, '  Sample size =     %6d\n', nsample );
  fprintf ( 1, '  Sample mean =     %14f\n', x_mean );
  fprintf ( 1, '  Sample variance = %14f\n', x_var );
  fprintf ( 1, '  Sample maximum =  %6d\n', x_max );
  fprintf ( 1, '  Sample minimum =  %6d\n', x_min );

  return
end
