WSJT-X/boost/libs/math/tools/gamma_P_inva_data.cpp

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// (C) Copyright John Maddock 2006.
// Use, modification and distribution are subject to 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)
#include <boost/math/special_functions/gamma.hpp>
#include <boost/math/constants/constants.hpp>
#include <boost/lexical_cast.hpp>
#include <fstream>
#include <boost/math/tools/test_data.hpp>
#include "mp_t.hpp"
using namespace boost::math::tools;
//
// Force trunctation to float precision of input values:
// we must ensure that the input values are exactly representable
// in whatever type we are testing, or the output values will all
// be thrown off:
//
float external_f;
float force_truncate(const float* f)
{
external_f = *f;
return external_f;
}
float truncate_to_float(mp_t r)
{
float f = boost::math::tools::real_cast<float>(r);
return force_truncate(&f);
}
struct gamma_inverse_generator_a
{
boost::math::tuple<mp_t, mp_t> operator()(const mp_t x, const mp_t p)
{
mp_t x1 = boost::math::gamma_p_inva(x, p);
mp_t x2 = boost::math::gamma_q_inva(x, p);
std::cout << "Inverse for " << x << " " << p << std::endl;
return boost::math::make_tuple(x1, x2);
}
};
int main(int argc, char*argv [])
{
bool cont;
std::string line;
parameter_info<mp_t> arg1, arg2;
test_data<mp_t> data;
std::cout << "Welcome.\n"
"This program will generate spot tests for the inverse incomplete gamma function:\n"
" gamma_p_inva(a, p) and gamma_q_inva(a, q)\n\n";
arg1 = make_power_param<mp_t>(mp_t(0), -4, 24);
arg2 = make_random_param<mp_t>(mp_t(0), mp_t(1), 15);
data.insert(gamma_inverse_generator_a(), arg1, arg2);
line = "igamma_inva_data.ipp";
std::ofstream ofs(line.c_str());
ofs << std::scientific << std::setprecision(40);
write_code(ofs, data, "igamma_inva_data");
return 0;
}