ceph/src/boost/libs/accumulators/test/rolling_moment.cpp

   1 //  Copyright (C) Eric Niebler 2005.
   2 //  Copyright (C) Pieter Bastiaan Ober 2014.
   3 //  Use, modification and distribution are subject to the
   4 //  Boost Software License, Version 1.0. (See accompanying file
   5 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #include <boost/test/unit_test.hpp>
   8 #include <boost/test/floating_point_comparison.hpp>
   9 #include <boost/mpl/assert.hpp>
  10 #include <boost/accumulators/accumulators.hpp>
  11 #include <boost/accumulators/statistics/stats.hpp>
  12 #include <boost/accumulators/statistics/rolling_moment.hpp>
  13
  14 using namespace boost;
  15 using namespace unit_test;
  16 using namespace accumulators;
  17
  18 template<typename T>
  19 void assert_is_double(T const &)
  20 {
  21     BOOST_MPL_ASSERT((is_same<T, double>));
  22 }
  23
  24 ///////////////////////////////////////////////////////////////////////////////
  25 // test_rolling_moment
  26 //
  27
  28 void test_rolling_second_moment()
  29 {
  30     accumulator_set<int, stats<tag::rolling_moment<2> > > acc(tag::rolling_moment<2>::window_size = 3);
  31
  32     acc(2);
  33
  34     BOOST_CHECK_CLOSE(rolling_moment<2>(acc), 4.0/1 ,1e-5);
  35
  36     acc(4);
  37
  38     BOOST_CHECK_CLOSE(rolling_moment<2>(acc), (4.0 + 16.0)/2, 1e-5);
  39
  40     acc(5);
  41
  42     BOOST_CHECK_CLOSE(rolling_moment<2>(acc), (4.0 + 16.0 + 25.0)/3, 1e-5);
  43
  44     acc(6);
  45
  46     BOOST_CHECK_CLOSE(rolling_moment<2>(acc), (16.0 + 25.0 + 36.0)/3, 1e-5);
  47
  48     assert_is_double(rolling_moment<2>(acc));
  49 }
  50
  51 void test_rolling_fifth_moment()
  52 {
  53     accumulator_set<int, stats<tag::rolling_moment<5> > > acc(tag::rolling_moment<2>::window_size = 3);
  54
  55     acc(2);
  56
  57     BOOST_CHECK_CLOSE(rolling_moment<5>(acc), 32.0/1, 1e-5);
  58
  59     acc(3);
  60
  61     BOOST_CHECK_CLOSE(rolling_moment<5>(acc), (32.0 + 243.0)/2, 1e-5);
  62
  63     acc(4);
  64
  65     BOOST_CHECK_CLOSE(rolling_moment<5>(acc), (32.0 + 243.0 + 1024.0)/3, 1e-5);
  66
  67     acc(5);
  68
  69     BOOST_CHECK_CLOSE(rolling_moment<5>(acc), (243.0 + 1024.0 + 3125.0)/3, 1e-5);
  70
  71     assert_is_double(rolling_moment<5>(acc));
  72 }
  73
  74 ///////////////////////////////////////////////////////////////////////////////
  75 // init_unit_test_suite
  76 //
  77 test_suite* init_unit_test_suite( int argc, char* argv[] )
  78 {
  79     test_suite *test = BOOST_TEST_SUITE("rolling moment test");
  80
  81     test->add(BOOST_TEST_CASE(&test_rolling_second_moment));
  82     test->add(BOOST_TEST_CASE(&test_rolling_fifth_moment));
  83
  84     return test;
  85 }