Initial commit

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;
+}
+