function chi_square_cdf_test ( ) %*****************************************************************************80 % %% CHI_SQUARE_CDF_TEST tests CHI_SQUARE_CDF, CHI_SQUARE_CDF_INV, CHI_SQUARE_PDF. % % Licensing: % % This code is distributed under the GNU LGPL license. % % Modified: % % 15 April 2009 % % Author: % % John Burkardt % fprintf ( 1, '\n' ); fprintf ( 1, 'CHI_SQUARE_CDF_TEST\n' ); fprintf ( 1, ' CHI_SQUARE_CDF evaluates the Chi Square CDF;\n' ); fprintf ( 1, ' CHI_SQUARE_CDF_INV inverts the Chi Square CDF.\n' ); fprintf ( 1, ' CHI_SQUARE_PDF evaluates the Chi Square PDF;\n' ); a = 4.0; fprintf ( 1, '\n' ); fprintf ( 1, ' PDF parameter A = %14g\n', a ); check = chi_square_check ( a ); if ( ~check ); fprintf ( 1, '\n' ); fprintf ( 1, 'CHI_SQUARE_CDF_TEST - Fatal error!\n' ); fprintf ( 1, ' The parameters are not legal.\n' ); return end seed = 123456789; fprintf ( 1, '\n' ); fprintf ( 1, ' X PDF CDF CDF_INV\n' ); fprintf ( 1, '\n' ); for i = 1 : 10 [ x, seed ] = chi_square_sample ( a, seed ); pdf = chi_square_pdf ( x, a ); cdf = chi_square_cdf ( x, a ); x2 = chi_square_cdf_inv ( cdf, a ); fprintf ( 1, ' %14g %14g %14g %14g\n', x, pdf, cdf, x2 ); end return end