101 lines
2.5 KiB
C++
101 lines
2.5 KiB
C++
// (C) Copyright John Maddock 2006.
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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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#define BOOST_MATH_MAX_SERIES_ITERATION_POLICY 10000000
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#include "mp_t.hpp"
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#include <boost/math/constants/constants.hpp>
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#include <boost/lexical_cast.hpp>
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#include <fstream>
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#include <map>
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#include <boost/math/tools/test_data.hpp>
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#include <boost/random.hpp>
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using namespace boost::math::tools;
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using namespace boost::math;
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using namespace std;
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struct hypergeometric_2f1_gen
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{
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mp_t operator()(mp_t a1, mp_t a2, mp_t b, mp_t z)
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{
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mp_t result = 0;
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mp_t abs_result = 0;
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mp_t term = 1;
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mp_t k = 0;
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do
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{
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result += term;
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abs_result += fabs(term);
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if (fabs(result) * boost::math::tools::epsilon<mp_t>() > fabs(term))
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break;
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++k;
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term *= a1++;
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term *= a2++;
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term /= b++;
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term /= k;
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term *= z;
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} while (true);
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//
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// check precision:
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//
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if (abs_result * boost::math::tools::epsilon<mp_t>() / fabs(result) > 1e-40)
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throw std::domain_error("Unable to calculate result");
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std::cout << a1 << " " << a2 << " " << b << " " << z << " " << result << std::endl;
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return result;
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}
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};
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int main(int, char* [])
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{
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parameter_info<mp_t> arg1, arg2, arg3, arg4;
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test_data<mp_t> data;
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std::cout << "Welcome.\n"
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"This program will generate spot tests for 2F0:\n";
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std::string line;
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bool cont;
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std::vector<mp_t> v;
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random_ns::mt19937 rnd;
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random_ns::uniform_real_distribution<float> ur_a(-100, 100);
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random_ns::uniform_real_distribution<float> ur_z(-1, 1);
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int num_spots;
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std::cout << "Enter how many test points to calculate: ";
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std::cin >> num_spots;
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do
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{
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mp_t a1 = ur_a(rnd);
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mp_t a2 = ur_a(rnd);
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mp_t b = ur_a(rnd);
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mp_t z = ur_z(rnd);
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arg1 = make_single_param(a1);
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arg2 = make_single_param(a2);
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arg3 = make_single_param(b);
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arg4 = make_single_param(z);
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data.insert(hypergeometric_2f1_gen(), arg1, arg2, arg3, arg4);
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} while (num_spots--);
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std::cout << "Enter name of test data file [default=hypergeometric_2f1.ipp]";
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std::getline(std::cin, line);
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boost::algorithm::trim(line);
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if(line == "")
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line = "hypergeometric_2f1.ipp";
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std::ofstream ofs(line.c_str());
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ofs << std::scientific << std::setprecision(40);
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write_code(ofs, data, line.c_str());
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return 0;
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}
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