function planck_sample_test ( )

%*****************************************************************************80
%
%% planck_sample_test() tests planck_sample().
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    12 April 2016
%
%  Author:
%
%    John Burkardt
%
  nsample = 1000;

  fprintf ( 1, '\n' );
  fprintf ( 1, 'PLANCK_SAMPLE_TEST():\n' );
  fprintf ( 1, '  PLANCK_MEAN() returns the mean of the Planck distribution.\n' );
  fprintf ( 1, '  PLANCK_SAMPLE() samples the Planck distribution.\n' );
  fprintf ( 1, '  PLANCK_VARIANCE() returns the variance of the Planck distribution.\n' );
  fprintf ( 1, '\n' );
  
  a = 2.0;
  b = 3.0;

  if ( ~ planck_check ( a, b ) )
    fprintf ( 1, '\n' );
    fprintf ( 1, 'PLANCK_SAMPLE_TEST():\n' );
    fprintf ( 1, '  The parameters are not legal.\n' );
    return;
  end

  fprintf ( 1, '\n' );
  fprintf ( 1, '  PDF parameter A = %14g\n', a );
  fprintf ( 1, '  PDF parameter B = %14g\n', b );

  xmean = planck_mean ( a, b );
  variance = planck_variance ( a, b );

  fprintf ( 1, '\n' );
  fprintf ( 1, '  PDF mean =     %14g\n', xmean );
  fprintf ( 1, '  PDF variance = %14g\n', variance );

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

  xmean = mean ( x );
  variance = r8vec_variance ( nsample, x );
  xmax = max ( x );
  xmin = min ( x );

  fprintf ( 1, '\n' );
  fprintf ( 1, '  Sample size =     %6d\n', nsample );
  fprintf ( 1, '  Sample mean =     %14g\n', xmean );
  fprintf ( 1, '  Sample variance = %14g\n', variance );
  fprintf ( 1, '  Sample maximum =  %14g\n', xmax );
  fprintf ( 1, '  Sample minimum =  %14g\n', xmin );

  return
end
