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// (C) Copyright Eric Niebler 2005.
// Use, modification and distribution are subject to the
// Boost Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#include <iostream>
#include <valarray>
#include <boost/utility/enable_if.hpp>
#include <boost/type_traits/is_floating_point.hpp>
#include <boost/test/unit_test.hpp>
#include <boost/test/floating_point_comparison.hpp>
#include <boost/accumulators/accumulators.hpp>
#include <boost/accumulators/numeric/functional/valarray.hpp>
#include <boost/accumulators/statistics/stats.hpp>
#include <boost/accumulators/statistics/min.hpp>
#include <boost/accumulators/statistics/max.hpp>
#include <boost/accumulators/statistics/mean.hpp>
#include <boost/accumulators/statistics/weighted_mean.hpp>
using namespace boost;
using namespace unit_test;
using namespace accumulators;
template<typename T>
typename boost::enable_if<is_floating_point<T> >::type is_equal_or_close(T const &left, T const &right)
{
BOOST_CHECK_CLOSE(left, right, 1e-5);
}
template<typename T>
typename boost::disable_if<is_floating_point<T> >::type is_equal_or_close(T const &left, T const &right)
{
BOOST_CHECK_EQUAL(left, right);
}
template<typename T>
void is_equal(std::valarray<T> const &left, std::valarray<T> const &right)
{
BOOST_CHECK_EQUAL(left.size(), right.size());
if(left.size() == right.size())
{
for(std::size_t i = 0; i < left.size(); ++i)
{
is_equal_or_close(left[i], right[i]);
}
}
}
namespace std
{
template<typename T>
inline std::ostream &operator <<(std::ostream &sout, std::valarray<T> const &arr)
{
sout << '(';
for(std::size_t i = 0; i < arr.size(); ++i)
{
sout << arr[i] << ',';
}
sout << ')' << std::endl;
return sout;
}
}
///////////////////////////////////////////////////////////////////////////////
// test_stat
//
void test_stat()
{
typedef std::valarray<int> sample_t;
// test sum
{
accumulator_set<sample_t, stats<tag::sum> > acc(sample = sample_t(0,3));
acc(sample_t(1,3));
acc(sample_t(2,3));
acc(sample_t(3,3));
is_equal(sample_t(6,3), sum(acc));
}
// test min and max
{
int s1[] = {1,2,3}, s2[] = {0,3,4}, s3[] = {2,1,4}, min_res[] = {0,1,3}, max_res[] = {2,3,4};
accumulator_set<sample_t, stats<tag::min, tag::max> > acc(sample = sample_t(0,3));
acc(sample_t(s1,3));
acc(sample_t(s2,3));
acc(sample_t(s3,3));
is_equal(sample_t(min_res,3), (min)(acc));
is_equal(sample_t(max_res,3), (max)(acc));
}
// test mean(lazy) and mean(immediate)
{
accumulator_set<sample_t, stats<tag::mean> > acc(sample = sample_t(0,3));
acc(sample_t(1,3));
is_equal(std::valarray<double>(1., 3), mean(acc));
BOOST_CHECK_EQUAL(1u, count(acc));
is_equal(sample_t(1, 3), sum(acc));
acc(sample_t(0,3));
is_equal(std::valarray<double>(0.5, 3), mean(acc));
BOOST_CHECK_EQUAL(2u, count(acc));
is_equal(sample_t(1, 3), sum(acc));
acc(sample_t(2,3));
is_equal(std::valarray<double>(1., 3), mean(acc));
BOOST_CHECK_EQUAL(3u, count(acc));
is_equal(sample_t(3, 3), sum(acc));
accumulator_set<sample_t, stats<tag::mean(immediate)> > acc2(sample = sample_t(0,3));
acc2(sample_t(1,3));
is_equal(std::valarray<double>(1., 3), mean(acc2));
BOOST_CHECK_EQUAL(1u, count(acc2));
acc2(sample_t(0,3));
is_equal(std::valarray<double>(0.5, 3), mean(acc2));
BOOST_CHECK_EQUAL(2u, count(acc2));
acc2(sample_t(2,3));
is_equal(std::valarray<double>(1., 3), mean(acc2));
BOOST_CHECK_EQUAL(3u, count(acc2));
}
// test weighted_mean
{
accumulator_set<sample_t, stats<tag::weighted_mean>, int> acc(sample = sample_t(0,3));
acc(sample_t(10,3), weight = 2); // 20
BOOST_CHECK_EQUAL(2, sum_of_weights(acc)); //
//
acc(sample_t(6,3), weight = 3); // 18
BOOST_CHECK_EQUAL(5, sum_of_weights(acc)); //
//
acc(sample_t(4,3), weight = 4); // 16
BOOST_CHECK_EQUAL(9, sum_of_weights(acc)); //
//
acc(sample_t(6,3), weight = 5); //+ 30
BOOST_CHECK_EQUAL(14, sum_of_weights(acc)); //
//= 84 / 14 = 6
is_equal(std::valarray<double>(6.,3), weighted_mean(acc));
accumulator_set<sample_t, stats<tag::weighted_mean(immediate)>, int> acc2(sample = sample_t(0,3));
acc2(sample_t(10,3), weight = 2); // 20
BOOST_CHECK_EQUAL(2, sum_of_weights(acc2)); //
//
acc2(sample_t(6,3), weight = 3); // 18
BOOST_CHECK_EQUAL(5, sum_of_weights(acc2)); //
//
acc2(sample_t(4,3), weight = 4); // 16
BOOST_CHECK_EQUAL(9, sum_of_weights(acc2)); //
//
acc2(sample_t(6,3), weight = 5); //+ 30
BOOST_CHECK_EQUAL(14, sum_of_weights(acc2));//
//= 84 / 14 = 6
is_equal(std::valarray<double>(6.,3), weighted_mean(acc2));
}
}
///////////////////////////////////////////////////////////////////////////////
// init_unit_test_suite
//
test_suite* init_unit_test_suite( int argc, char* argv[] )
{
test_suite *test = BOOST_TEST_SUITE("valarray test");
test->add(BOOST_TEST_CASE(&test_stat));
return test;
}
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