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beta_data.cpp
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68 lines (56 loc) · 1.7 KB
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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/math/tools/test_data.hpp>
#include <fstream>
#include "mp_t.hpp"
using namespace boost::math::tools;
struct beta_data_generator
{
mp_t operator()(mp_t a, mp_t b)
{
if(a < b)
throw std::domain_error("");
// very naively calculate spots:
mp_t g1, g2, g3;
int s1, s2, s3;
g1 = boost::math::lgamma(a, &s1);
g2 = boost::math::lgamma(b, &s2);
g3 = boost::math::lgamma(a+b, &s3);
g1 += g2 - g3;
g1 = exp(g1);
g1 *= s1 * s2 * s3;
return g1;
}
};
int main()
{
parameter_info<mp_t> arg1, arg2;
test_data<mp_t> data;
std::cout << "Welcome.\n"
"This program will generate spot tests for the beta function:\n"
" beta(a, b)\n\n";
bool cont;
std::string line;
do{
get_user_parameter_info(arg1, "a");
get_user_parameter_info(arg2, "b");
data.insert(beta_data_generator(), arg1, arg2);
std::cout << "Any more data [y/n]?";
std::getline(std::cin, line);
boost::algorithm::trim(line);
cont = (line == "y");
}while(cont);
std::cout << "Enter name of test data file [default=beta_data.ipp]";
std::getline(std::cin, line);
boost::algorithm::trim(line);
if(line == "")
line = "beta_data.ipp";
std::ofstream ofs(line.c_str());
ofs << std::scientific << std::setprecision(40);
write_code(ofs, data, "beta_data");
return 0;
}