1 /* test_bernoulli.cpp
2 *
3 * Copyright Steven Watanabe 2011
4 * Distributed under the Boost Software License, Version 1.0. (See
5 * accompanying file LICENSE_1_0.txt or copy at
6 * http://www.boost.org/LICENSE_1_0.txt)
7 *
8 * $Id$
9 *
10 */
11
12 #include <boost/random/bernoulli_distribution.hpp>
13 #include <boost/random/uniform_int.hpp>
14 #include <boost/random/uniform_01.hpp>
15 #include <boost/random/mersenne_twister.hpp>
16 #include <boost/math/distributions/binomial.hpp>
17 #include <boost/lexical_cast.hpp>
18 #include <boost/exception/diagnostic_information.hpp>
19 #include <vector>
20 #include <iostream>
21 #include <numeric>
22
23 #include "chi_squared_test.hpp"
24
do_test(double p,long long max)25 bool do_test(double p, long long max) {
26 std::cout << "running bernoulli(" << p << ")" << " " << max << " times: " << std::flush;
27
28 boost::math::binomial expected(static_cast<double>(max), p);
29
30 boost::random::bernoulli_distribution<> dist(p);
31 boost::mt19937 gen;
32 long long count = 0;
33 for(long long i = 0; i < max; ++i) {
34 if(dist(gen)) ++count;
35 }
36
37 double prob = cdf(expected, count);
38
39 bool result = prob < 0.99 && prob > 0.01;
40 const char* err = result? "" : "*";
41 std::cout << std::setprecision(17) << prob << err << std::endl;
42
43 std::cout << std::setprecision(6);
44
45 return result;
46 }
47
do_tests(int repeat,long long trials)48 bool do_tests(int repeat, long long trials) {
49 boost::mt19937 gen;
50 boost::uniform_01<> rdist;
51 int errors = 0;
52 for(int i = 0; i < repeat; ++i) {
53 if(!do_test(rdist(gen), trials)) {
54 ++errors;
55 }
56 }
57 if(errors != 0) {
58 std::cout << "*** " << errors << " errors detected ***" << std::endl;
59 }
60 return errors == 0;
61 }
62
usage()63 int usage() {
64 std::cerr << "Usage: test_bernoulli_distribution -r <repeat> -t <trials>" << std::endl;
65 return 2;
66 }
67
68 template<class T>
handle_option(int & argc,char ** & argv,char opt,T & value)69 bool handle_option(int& argc, char**& argv, char opt, T& value) {
70 if(argv[0][1] == opt && argc > 1) {
71 --argc;
72 ++argv;
73 value = boost::lexical_cast<T>(argv[0]);
74 return true;
75 } else {
76 return false;
77 }
78 }
79
main(int argc,char ** argv)80 int main(int argc, char** argv) {
81 int repeat = 10;
82 long long trials = 1000000ll;
83
84 if(argc > 0) {
85 --argc;
86 ++argv;
87 }
88 while(argc > 0) {
89 if(argv[0][0] != '-') return usage();
90 else if(!handle_option(argc, argv, 'r', repeat)
91 && !handle_option(argc, argv, 't', trials)) {
92 return usage();
93 }
94 --argc;
95 ++argv;
96 }
97
98 try {
99 if(do_tests(repeat, trials)) {
100 return 0;
101 } else {
102 return EXIT_FAILURE;
103 }
104 } catch(...) {
105 std::cerr << boost::current_exception_diagnostic_information() << std::endl;
106 return EXIT_FAILURE;
107 }
108 }
109