87 lines
2.7 KiB
C++
87 lines
2.7 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/beta.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 <boost/random.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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boost::mt19937 rnd;
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boost::uniform_real<float> ur_a(1.0F, 5.0F);
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boost::variate_generator<boost::mt19937, boost::uniform_real<float> > gen(rnd, ur_a);
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boost::uniform_real<float> ur_a2(0.0F, 100.0F);
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boost::variate_generator<boost::mt19937, boost::uniform_real<float> > gen2(rnd, ur_a2);
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struct ibeta_inv_data_generator
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{
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boost::math::tuple<mp_t, mp_t, mp_t, mp_t, mp_t> operator()(mp_t ap, mp_t bp, mp_t x_)
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{
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float a = truncate_to_float(real_cast<float>(gen() * pow(mp_t(10), ap)));
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float b = truncate_to_float(real_cast<float>(gen() * pow(mp_t(10), bp)));
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float x = truncate_to_float(real_cast<float>(x_));
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std::cout << a << " " << b << " " << x << std::flush;
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mp_t inv = boost::math::ibeta_inv(mp_t(a), mp_t(b), mp_t(x));
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std::cout << " " << inv << std::flush;
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mp_t invc = boost::math::ibetac_inv(mp_t(a), mp_t(b), mp_t(x));
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std::cout << " " << invc << std::endl;
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return boost::math::make_tuple(a, b, x, inv, invc);
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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, arg3;
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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 beta function:\n"
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" ibeta_inv(a, p) and ibetac_inv(a, q)\n\n";
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arg1 = make_periodic_param(mp_t(-5), mp_t(6), 11);
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arg2 = make_periodic_param(mp_t(-5), mp_t(6), 11);
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arg3 = make_random_param(mp_t(0.0001), mp_t(1), 10);
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arg1.type |= dummy_param;
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arg2.type |= dummy_param;
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arg3.type |= dummy_param;
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data.insert(ibeta_inv_data_generator(), arg1, arg2, arg3);
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line = "ibeta_inv_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, "ibeta_inv_data");
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return 0;
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}
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