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e8c40e309c
* Implement logaddexp * Disable test for ASAN * Implement logsumexp * Add performance file and include results in the docs * Address review comments * Simplify overflow test and comply with min/max guidelines * Minor cleanup * FIxes to comments and docs [ci skip] * Return status code. Co-authored-by: Nick Thompson <nathompson7@protonmail.com>
55 lines
1.6 KiB
C++
55 lines
1.6 KiB
C++
// (C) Copyright Matt Borland 2022.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include "math_unit_test.hpp"
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#include <limits>
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#include <boost/math/special_functions/logaddexp.hpp>
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#include <boost/math/constants/constants.hpp>
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template <typename Real>
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void test()
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{
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using boost::math::logaddexp;
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using std::log;
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using std::exp;
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constexpr Real nan_val = std::numeric_limits<Real>::quiet_NaN();
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constexpr Real inf_val = std::numeric_limits<Real>::infinity();
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// NAN
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CHECK_NAN(logaddexp(nan_val, Real(1)));
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CHECK_NAN(logaddexp(Real(1), nan_val));
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CHECK_NAN(logaddexp(nan_val, nan_val));
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// INF
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CHECK_EQUAL(logaddexp(inf_val, Real(1)), inf_val);
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CHECK_EQUAL(logaddexp(Real(1), inf_val), inf_val);
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CHECK_EQUAL(logaddexp(inf_val, inf_val), inf_val);
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// Equal values
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constexpr Real ln2 = boost::math::constants::ln_two<Real>();
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CHECK_ULP_CLOSE(Real(2) + ln2, logaddexp(Real(2), Real(2)), 1);
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CHECK_ULP_CLOSE(Real(1e-50) + ln2, logaddexp(Real(1e-50), Real(1e-50)), 1);
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// Spot check
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// https://numpy.org/doc/stable/reference/generated/numpy.logaddexp.html
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// Calculated at higher precision using wolfram alpha
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Real x1 = 1e-50l;
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Real x2 = 2.5e-50l;
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Real spot1 = static_cast<Real>(exp(x1));
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Real spot2 = static_cast<Real>(exp(x2));
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Real spot12 = logaddexp(x1, x2);
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CHECK_ULP_CLOSE(log(spot1 + spot2), spot12, 1);
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}
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int main (void)
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{
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test<float>();
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test<double>();
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test<long double>();
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return boost::math::test::report_errors();
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}
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