function half_normal_cdf_test ( ) %*****************************************************************************80 % %% HALF_NORMAL_CDF_TEST tests HALF_NORMAL_CDF. % % Licensing: % % This code is distributed under the GNU LGPL license. % % Modified: % % 04 April 2016 % % Author: % % John Burkardt % fprintf ( 1, '\n' ); fprintf ( 1, 'HALF_NORMAL_CDF_TEST\n' ); fprintf ( 1, ' HALF_NORMAL_CDF evaluates the Half Normal CDF.\n' ); fprintf ( 1, ' HALF_NORMAL_CDF_INV inverts the Half Normal CDF.\n' ); fprintf ( 1, ' HALF_NORMAL_PDF evaluates the Half Normal PDF.\n' ); a = 0.0; b = 2.0; check = half_normal_check ( a, b ); if ( ~ check ); fprintf ( 1, '\n' ); fprintf ( 1, 'HALF_NORMAL_CDF_TEST - Fatal error!\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 ); seed = 123456789; fprintf ( 1, '\n' ); fprintf ( 1, ' X PDF CDF CDF_INV\n' ); fprintf ( 1, '\n' ); for i = 1 : 10 [ x, seed ] = half_normal_sample ( a, b, seed ); pdf = half_normal_pdf ( x, a, b ); cdf = half_normal_cdf ( x, a, b ); x2 = half_normal_cdf_inv ( cdf, a, b ); fprintf ( 1, ' %14g %14g %14g %14g\n', x, pdf, cdf, x2 ); end return end