70 lines
1.9 KiB
C++
70 lines
1.9 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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#include <boost/math/special_functions/gamma.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 <boost/math/tools/test_data.hpp>
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#include "mp_t.hpp"
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using namespace boost::math::tools;
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//
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// Force trunctation to float precision of input values:
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// we must ensure that the input values are exactly representable
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// in whatever type we are testing, or the output values will all
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// be thrown off:
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//
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float external_f;
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float force_truncate(const float* f)
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{
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external_f = *f;
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return external_f;
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}
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float truncate_to_float(mp_t r)
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{
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float f = boost::math::tools::real_cast<float>(r);
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return force_truncate(&f);
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}
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struct gamma_inverse_generator_a
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{
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boost::math::tuple<mp_t, mp_t> operator()(const mp_t x, const mp_t p)
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{
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mp_t x1 = boost::math::gamma_p_inva(x, p);
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mp_t x2 = boost::math::gamma_q_inva(x, p);
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std::cout << "Inverse for " << x << " " << p << std::endl;
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return boost::math::make_tuple(x1, x2);
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}
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};
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int main(int argc, char*argv [])
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{
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bool cont;
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std::string line;
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parameter_info<mp_t> arg1, arg2;
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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 the inverse incomplete gamma function:\n"
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" gamma_p_inva(a, p) and gamma_q_inva(a, q)\n\n";
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arg1 = make_power_param<mp_t>(mp_t(0), -4, 24);
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arg2 = make_random_param<mp_t>(mp_t(0), mp_t(1), 15);
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data.insert(gamma_inverse_generator_a(), arg1, arg2);
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line = "igamma_inva_data.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, "igamma_inva_data");
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return 0;
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}
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