function prob_test089 ( ) %*****************************************************************************80 % %% TEST089 tests HALF_NORMAL_MEAN, HALF_NORMAL_SAMPLE, HALF_NORMAL_VARIANCE. % % Licensing: % % This code is distributed under the GNU LGPL license. % % Modified: % % 15 April 2009 % % Author: % % John Burkardt % nsample = 1000; seed = 123456789; fprintf ( 1, '\n' ); fprintf ( 1, 'TEST089\n' ); fprintf ( 1, ' For the Half Normal PDF:\n' ); fprintf ( 1, ' HALF_NORMAL_MEAN computes the mean;\n' ); fprintf ( 1, ' HALF_NORMAL_SAMPLE samples;\n' ); fprintf ( 1, ' HALF_NORMAL_VARIANCE computes the variance.\n' ); a = 0.0; b = 10.0; check = half_normal_check ( a, b ); if ( ~check ); fprintf ( 1, '\n' ); fprintf ( 1, 'TEST089 - Fatal error!\n' ); fprintf ( 1, ' The parameters are not legal.\n' ); return end mean = half_normal_mean ( a, b ); variance = half_normal_variance ( a, b ); fprintf ( 1, '\n' ); fprintf ( 1, ' PDF parameter A = %14f\n', a ); fprintf ( 1, ' PDF parameter B = %14f\n', b ); fprintf ( 1, ' PDF mean = %14f\n', mean ); fprintf ( 1, ' PDF variance = %14f\n', variance ); for i = 1 : nsample [ x(i), seed ] = half_normal_sample ( a, b, seed ); end mean = r8vec_mean ( nsample, x ); variance = r8vec_variance ( nsample, x ); xmax = max ( x(1:nsample) ); xmin = min ( x(1:nsample) ); fprintf ( 1, '\n' ); fprintf ( 1, ' Sample size = %6d\n', nsample ); fprintf ( 1, ' Sample mean = %14f\n', mean ); fprintf ( 1, ' Sample variance = %14f\n', variance ); fprintf ( 1, ' Sample maximum = %14f\n', xmax ); fprintf ( 1, ' Sample minimum = %14f\n', xmin ); return end