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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);
- }
- //
- // Our generator takes two arguments, but the second is interpreted
- // as an instruction not a value, the second argument won't be placed
- // in the output matrix by class test_data, so we add our algorithmically
- // derived second argument to the output.
- //
- struct igamma_data_generator
- {
- boost::math::tuple<mp_t, mp_t, mp_t, mp_t, mp_t> operator()(mp_t a, mp_t x)
- {
- // very naively calculate spots:
- mp_t z;
- switch((int)real_cast<float>(x))
- {
- case 1:
- z = truncate_to_float((std::min)(mp_t(1), a/100));
- break;
- case 2:
- z = truncate_to_float(a / 2);
- break;
- case 3:
- z = truncate_to_float((std::max)(0.9*a, a - 2));
- break;
- case 4:
- z = a;
- break;
- case 5:
- z = truncate_to_float((std::min)(1.1*a, a + 2));
- break;
- case 6:
- z = truncate_to_float(a * 2);
- break;
- case 7:
- z = truncate_to_float((std::max)(mp_t(100), a*100));
- break;
- default:
- BOOST_ASSERT(0 == "Can't get here!!");
- }
- //mp_t g = boost::math::tgamma(a);
- mp_t lg = boost::math::tgamma_lower(a, z);
- mp_t ug = boost::math::tgamma(a, z);
- mp_t rlg = boost::math::gamma_p(a, z);
- mp_t rug = boost::math::gamma_q(a, z);
- return boost::math::make_tuple(z, ug, rug, lg, rlg);
- }
- };
- struct gamma_inverse_generator
- {
- boost::math::tuple<mp_t, mp_t> operator()(const mp_t a, const mp_t p)
- {
- mp_t x1 = boost::math::gamma_p_inv(a, p);
- mp_t x2 = boost::math::gamma_q_inv(a, p);
- std::cout << "Inverse for " << a << " " << p << std::endl;
- return boost::math::make_tuple(x1, x2);
- }
- };
- 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;
- if((argc >= 2) && (std::strcmp(argv[1], "-inverse") == 0))
- {
- std::cout << "Welcome.\n"
- "This program will generate spot tests for the inverse incomplete gamma function:\n"
- " gamma_p_inv(a, p) and gamma_q_inv(a, q)\n\n";
- do{
- get_user_parameter_info(arg1, "a");
- get_user_parameter_info(arg2, "p");
- data.insert(gamma_inverse_generator(), arg1, arg2);
- std::cout << "Any more data [y/n]?";
- std::getline(std::cin, line);
- boost::algorithm::trim(line);
- cont = (line == "y");
- }while(cont);
- }
- else if((argc >= 2) && (std::strcmp(argv[1], "-inverse_a") == 0))
- {
- 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";
- do{
- get_user_parameter_info(arg1, "x");
- get_user_parameter_info(arg2, "p");
- data.insert(gamma_inverse_generator_a(), arg1, arg2);
- std::cout << "Any more data [y/n]?";
- std::getline(std::cin, line);
- boost::algorithm::trim(line);
- cont = (line == "y");
- }while(cont);
- }
- else
- {
- arg2 = make_periodic_param(mp_t(1), mp_t(8), 7);
- arg2.type |= boost::math::tools::dummy_param;
- std::cout << "Welcome.\n"
- "This program will generate spot tests for the incomplete gamma function:\n"
- " gamma(a, z)\n\n";
- do{
- get_user_parameter_info(arg1, "a");
- data.insert(igamma_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=igamma_data.ipp]";
- std::getline(std::cin, line);
- boost::algorithm::trim(line);
- if(line == "")
- line = "igamma_data.ipp";
- std::ofstream ofs(line.c_str());
- ofs << std::scientific << std::setprecision(40);
- write_code(ofs, data, "igamma_data");
-
- return 0;
- }
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