function poisson_sample_test ( ) %*****************************************************************************80 % %% POISSON_SAMPLE_TEST tests POISSON_SAMPLE. % % Licensing: % % This code is distributed under the GNU LGPL license. % % Modified: % % 27 March 2016 % % Author: % % John Burkardt % nsample = 1000; seed = 123456789; fprintf ( 1, '\n' ); fprintf ( 1, 'POISSON_SAMPLE_TEST\n' ); fprintf ( 1, ' POISSON_MEAN computes the Poisson mean;\n' ); fprintf ( 1, ' POISSON_SAMPLE samples the Poisson distribution;\n' ); fprintf ( 1, ' POISSON_VARIANCE computes the Poisson variance.\n' ); a = 10.0; check = poisson_check ( a ); if ( ~ check ); fprintf ( 1, '\n' ); fprintf ( 1, 'POISSON_SAMPLE_TEST - Fatal error!\n' ); fprintf ( 1, ' The parameters are not legal.\n' ); return end mean = poisson_mean ( a ); variance = poisson_variance ( a ); fprintf ( 1, '\n' ); fprintf ( 1, ' PDF parameter A = %14g\n', a ); fprintf ( 1, ' PDF mean = %14g\n', mean ); fprintf ( 1, ' PDF variance = %14g\n', variance ); for i = 1 : nsample [ x(i), seed ] = poisson_sample ( a, seed ); end mean = i4vec_mean ( nsample, x ); variance = i4vec_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 = %14g\n', mean ); fprintf ( 1, ' Sample variance = %14g\n', variance ); fprintf ( 1, ' Sample maximum = %6d\n', xmax ); fprintf ( 1, ' Sample minimum = %6d\n', xmin ); return end