ceph/src/boost/libs/math/tools/hyp_0f2_data.cpp

   1 //  (C) Copyright John Maddock 2006.
   2 //  Use, modification and distribution are subject to the
   3 //  Boost Software License, Version 1.0. (See accompanying file
   4 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #define BOOST_MATH_MAX_SERIES_ITERATION_POLICY 10000000
   7
   8 #include <boost/math/constants/constants.hpp>
   9 #include <boost/lexical_cast.hpp>
  10 #include <fstream>
  11 #include <map>
  12 #include <boost/math/tools/test_data.hpp>
  13 #include <boost/random.hpp>
  14 #include "mp_t.hpp"
  15
  16 using namespace boost::math::tools;
  17 using namespace boost::math;
  18 using namespace std;
  19
  20 struct hypergeometric_0f2_gen
  21 {
  22    mp_t operator()(mp_t b1, mp_t b2, mp_t z)
  23    {
  24       mp_t result = 0;
  25       mp_t abs_result = 0;
  26       mp_t term = 1;
  27       mp_t k = 0;
  28
  29       do
  30       {
  31          result += term;
  32          abs_result += fabs(term);
  33          if (fabs(result) * boost::math::tools::epsilon<mp_t>() > fabs(term))
  34             break;
  35          ++k;
  36          term /= b1++;
  37          term /= b2++;
  38          term /= k;
  39          term *= z;
  40       } while (true);
  41       //
  42       // check precision:
  43       //
  44       if (abs_result * boost::math::tools::epsilon<mp_t>() / fabs(result) > 1e-40)
  45          throw std::domain_error("Unable to calculate result");
  46
  47       std::cout << b1 << " " << b2 << " " << z << " " << result << std::endl;
  48       return result;
  49    }
  50 };
  51
  52 int main(int, char* [])
  53 {
  54    parameter_info<mp_t> arg1, arg2, arg3, arg4;
  55    test_data<mp_t> data;
  56
  57    std::cout << "Welcome.\n"
  58       "This program will generate spot tests for 2F0:\n";
  59
  60    std::string line;
  61    bool cont = true;
  62
  63    while (cont)
  64    {
  65       float range;
  66       std::cout << "Enter the range to calculate over for b1 and b2 (single value, range will be -x to x): ";
  67       std::cin >> range;
  68
  69       float z_range;
  70       std::cout << "Enter the range to calculate over for z (single value, range will be -x to x): ";
  71       std::cin >> z_range;
  72
  73       int num_spots;
  74       std::cout << "Enter how many test points to calculate: ";
  75       std::cin >> num_spots;
  76
  77       std::vector<mp_t> v;
  78       random_ns::mt19937 rnd;
  79       random_ns::uniform_real_distribution<float> ur_a(-range, range);
  80       random_ns::uniform_real_distribution<float> ur_z(-z_range, z_range);
  81
  82       do
  83       {
  84          mp_t b1 = ur_a(rnd);
  85          mp_t b2 = ur_a(rnd);
  86          mp_t z = ur_z(rnd);
  87
  88          arg1 = make_single_param(b1);
  89          arg2 = make_single_param(b2);
  90          arg3 = make_single_param(z);
  91          data.insert(hypergeometric_0f2_gen(), arg1, arg2, arg3);
  92       } while (num_spots--);
  93
  94       std::cout << "Any more data?";
  95       std::cin >> cont;
  96
  97    }
  98
  99
 100
 101    std::cout << "Enter name of test data file [default=hypergeometric_0f2.ipp]";
 102    std::getline(std::cin, line);
 103    boost::algorithm::trim(line);
 104    if(line == "")
 105       line = "hypergeometric_0f2.ipp";
 106    std::ofstream ofs(line.c_str());
 107    ofs << std::scientific << std::setprecision(40);
 108    write_code(ofs, data, line.c_str());
 109
 110    return 0;
 111 }
 112
 113