function prob_test088 ( ) %*****************************************************************************80 % %% TEST088 tests HALF_NORMAL_CDF, HALF_NORMAL_CDF_INV, HALF_NORMAL_PDF; % % Licensing: % % This code is distributed under the GNU LGPL license. % % Modified: % % 15 April 2009 % % Author: % % John Burkardt % fprintf ( 1, '\n' ); fprintf ( 1, 'TEST088\n' ); fprintf ( 1, ' For the Half Normal PDF:\n' ); fprintf ( 1, ' HALF_NORMAL_CDF evaluates the CDF.\n' ); fprintf ( 1, ' HALF_NORMAL_CDF_INV inverts the CDF.\n' ); fprintf ( 1, ' HALF_NORMAL_PDF evaluates the PDF.\n' ); a = 0.0; b = 2.0; check = half_normal_check ( a, b ); if ( ~check ); fprintf ( 1, '\n' ); fprintf ( 1, 'TEST088 - Fatal error!\n' ); fprintf ( 1, ' The parameters are not legal.\n' ); return end fprintf ( 1, '\n' ); fprintf ( 1, ' PDF parameter A = %14f\n', a ); fprintf ( 1, ' PDF parameter B = %14f\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, ' %14f %14f %14f %14f\n', x, pdf, cdf, x2 ); end return end