function f_sample_test ( )

%*****************************************************************************80
%
%% f_sample_test() tests f_sample().
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    15 April 2009
%
%  Author:
%
%    John Burkardt
%
  nsample = 1000;

  fprintf ( 1, '\n' );
  fprintf ( 1, 'f_sample_test():\n' );
  fprintf ( 1, '  f_mean() computes the F mean;\n' );
  fprintf ( 1, '  f_sample() samples the F distribution;\n' );
  fprintf ( 1, '  f_variance() computes the F variance.\n' );

  m = 8;
  n = 6;

  if ( ~ f_check ( m, n ) )
    fprintf ( 1, '\n' );
    fprintf ( 1, 'f_sample_test(): Fatal error!\n' );
    fprintf ( 1, '  The parameters are not legal!\n' );
    return
  end

  xmean = f_mean ( m, n );
  variance = f_variance ( m, n );

  fprintf ( 1, '\n' );
  fprintf ( 1, '  PDF parameter M =       %6d\n', m );
  fprintf ( 1, '  PDF parameter N =       %6d\n', n );
  fprintf ( 1, '  PDF mean =              %14g\n', xmean );
  fprintf ( 1, '  PDF variance =          %14g\n', variance );
  
  for i = 1 : nsample
    x(i) = f_sample ( m, n );
  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
