70 lines
1.8 KiB
C++
70 lines
1.8 KiB
C++
/*
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* Copyright Nick Thompson, 2019
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* Use, modification and distribution are subject to the
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* Boost Software License, Version 1.0. (See accompanying file
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* LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*/
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#include "math_unit_test.hpp"
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#include <numeric>
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#include <utility>
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#include <random>
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#include <boost/core/demangle.hpp>
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#include <boost/math/distributions/empirical_cumulative_distribution_function.hpp>
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#ifdef BOOST_HAS_FLOAT128
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#include <boost/multiprecision/float128.hpp>
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using boost::multiprecision::float128;
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#endif
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using boost::math::empirical_cumulative_distribution_function;
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template<class Z>
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void test_uniform_z()
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{
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std::vector<Z> v{6,3,4,1,2,5};
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auto ecdf = empirical_cumulative_distribution_function(std::move(v));
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CHECK_ULP_CLOSE(1.0/6.0, ecdf(1), 1);
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CHECK_ULP_CLOSE(2.0/6.0, ecdf(2), 1);
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CHECK_ULP_CLOSE(3.0/6.0, ecdf(3), 1);
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CHECK_ULP_CLOSE(4.0/6.0, ecdf(4), 1);
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CHECK_ULP_CLOSE(5.0/6.0, ecdf(5), 1);
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CHECK_ULP_CLOSE(6.0/6.0, ecdf(6), 1);
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// Less trivial:
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v = {6,3,4,1,1,1,2,4};
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ecdf = empirical_cumulative_distribution_function(std::move(v));
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CHECK_ULP_CLOSE(3.0/8.0, ecdf(1), 1);
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CHECK_ULP_CLOSE(4.0/8.0, ecdf(2), 1);
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CHECK_ULP_CLOSE(5.0/8.0, ecdf(3), 1);
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CHECK_ULP_CLOSE(7.0/8.0, ecdf(4), 1);
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CHECK_ULP_CLOSE(7.0/8.0, ecdf(5), 1);
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CHECK_ULP_CLOSE(8.0/8.0, ecdf(6), 1);
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}
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template<class Real>
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void test_uniform()
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{
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size_t n = 128;
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std::vector<Real> v(n);
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for (size_t i = 0; i < n; ++i) {
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v[i] = Real(i+1)/Real(n);
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}
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auto ecdf = empirical_cumulative_distribution_function(std::move(v));
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for (size_t i = 0; i < n; ++i) {
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CHECK_ULP_CLOSE(Real(i+1)/Real(n), ecdf(Real(i+1)/Real(n)), 1);
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}
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}
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int main()
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{
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test_uniform_z<int>();
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test_uniform<double>();
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return boost::math::test::report_errors();
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}
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