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65 lines
1.6 KiB
C++
65 lines
1.6 KiB
C++
// Copyright John Maddock 2006.
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// Copyright Paul A. Bristow 2007.
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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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#include <pch.hpp>
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#include <boost/math/tools/minima.hpp>
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#define BOOST_TEST_MAIN
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#include <boost/test/unit_test.hpp>
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#include <boost/test/floating_point_comparison.hpp>
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#include <boost/math/special_functions/gamma.hpp>
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#include <iostream>
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#include <iomanip>
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template <class T>
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struct poly_test
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{
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// minima is at (3,4):
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T operator()(const T& v)
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{
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T a = v - 3;
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return 3 * a * a + 4;
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}
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};
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template <class T>
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void test_minima(T, const char* /* name */)
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{
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std::pair<T, T> m = boost::math::tools::brent_find_minima(poly_test<T>(), T(-10), T(10), 50);
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BOOST_CHECK_CLOSE(m.first, T(3), T(0.001));
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BOOST_CHECK_CLOSE(m.second, T(4), T(0.001));
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T (*fp)(T);
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#if defined(BOOST_MATH_NO_DEDUCED_FUNCTION_POINTERS)
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fp = boost::math::lgamma<T>;
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#else
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fp = boost::math::lgamma;
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#endif
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m = boost::math::tools::brent_find_minima(fp, T(0.5), T(10), 50);
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BOOST_CHECK_CLOSE(m.first, T(1.461632), T(0.1));
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#if defined(BOOST_MATH_NO_DEDUCED_FUNCTION_POINTERS)
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fp = boost::math::tgamma<T>;
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#else
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fp = boost::math::tgamma;
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#endif
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m = boost::math::tools::brent_find_minima(fp, T(0.5), T(10), 50);
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BOOST_CHECK_CLOSE(m.first, T(1.461632), T(0.1));
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}
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BOOST_AUTO_TEST_CASE( test_main )
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{
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test_minima(0.1f, "float");
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test_minima(0.1, "double");
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#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
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test_minima(0.1L, "long double");
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#endif
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}
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