Initial commit

libs/math/tools/beta_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/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;
+}
+