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Library/boost/libs/math/example/lambert_w_basic_example.cpp
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19 дек 2024, 19:11
19 дек 2024, 19:11
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// Copyright Paul A. Bristow 2018 // Distributed under 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) // Example of most basic call of both lambert W functions. // Only requires C++03 // (and optionally a call of max_digits10 to show precision). #include <boost/math/special_functions/lambert_w.hpp> // For lambert_w0 and wm1 functions. #include <iostream> #include <iomanip> int main() { double z = 2.0; double w0 = boost::math::lambert_w0(z); std::cout.setf(std::ios_base::showpoint); // Include any trailing zeros. std::cout.precision(std::numeric_limits<double>::max_digits10); // Show all possibly significant digits. // Avoid using max_digfigs10 so as many old compilers can run the most basic lambert_w0 test? // Require to get max_digits10 // [ run lambert_w_basic_example.cpp : : : [ requires cxx11_numeric_limits ] ] std::cout << " lambert_w0(" << z << ") = " << w0 << std::endl; // lambert_w0(2.00000) = 0.852606 z = -0.2; double wm1 = boost::math::lambert_wm1(z); std::cout << " lambert_wm1(" << z << ") = " << wm1 << std::endl; // lambert_wm1(-0.200000) = -2.54264 return 0; } // int main()