function prob_test141 ( ) %*****************************************************************************80 % %% TEST141 tests STUDENT_MEAN, STUDENT_SAMPLE, STUDENT_VARIANCE. % % Licensing: % % This code is distributed under the GNU LGPL license. % % Modified: % % 14 February 2003 % % Author: % % John Burkardt % nsample = 1000; seed = 123456789; fprintf ( 1, '\n' ); fprintf ( 1, 'TEST141\n' ); fprintf ( 1, ' For the central Student PDF:\n' ); fprintf ( 1, ' STUDENT_MEAN computes the mean;\n' ); fprintf ( 1, ' STUDENT_SAMPLE samples;\n' ); fprintf ( 1, ' STUDENT_VARIANCE computes the variance.\n' ); a = 0.5; b = 2.0; c = 6.0; check = student_check ( a, b, c ); if ( ~check ); fprintf ( 1, '\n' ); fprintf ( 1, 'TEST141 - Fatal error!\n' ); fprintf ( 1, ' The parameters are not legal.\n' ); return end mean = student_mean ( a, b, c ); variance = student_variance ( a, b, c ); fprintf ( 1, '\n' ); fprintf ( 1, ' PDF parameter A = %14f\n', a ); fprintf ( 1, ' PDF parameter B = %14f\n', b ); fprintf ( 1, ' PDF parameter C = %14f\n', c ); fprintf ( 1, ' PDF mean = %14f\n', mean ); fprintf ( 1, ' PDF variance = %14f\n', variance ); for i = 1 : nsample [ x(i), seed ] = student_sample ( a, b, c, 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