ceph/src/boost/libs/math/tools/hyp_1f2_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_1f2_gen
  21 {
  22    mp_t operator()(mp_t a1, 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 *= a1++;
  37          term /= b1++;
  38          term /= b2++;
  39          term /= k;
  40          term *= z;
  41       } while (true);
  42       //
  43       // check precision:
  44       //
  45       if (abs_result * boost::math::tools::epsilon<mp_t>() / fabs(result) > 1e-40)
  46          throw std::domain_error("Unable to calculate result");
  47
  48       std::cout << a1 << " " << b1 << " " << b2 << " " << z << " " << result << std::endl;
  49       return result;
  50    }
  51 };
  52
  53 int main(int, char* [])
  54 {
  55    parameter_info<mp_t> arg1, arg2, arg3, arg4;
  56    test_data<mp_t> data;
  57
  58    std::cout << "Welcome.\n"
  59       "This program will generate spot tests for 2F0:\n";
  60
  61    std::string line;
  62    bool cont = true;
  63
  64    while (cont)
  65    {
  66       float range;
  67       std::cout << "Enter the range to calculate over for a1, b1 and b2 (single value, range will be -x to x): ";
  68       std::cin >> range;
  69
  70       float z_range;
  71       std::cout << "Enter the range to calculate over for z (single value, range will be -x to x): ";
  72       std::cin >> z_range;
  73
  74       int num_spots;
  75       std::cout << "Enter how many test points to calculate: ";
  76       std::cin >> num_spots;
  77
  78       std::vector<mp_t> v;
  79       random_ns::mt19937 rnd;
  80       random_ns::uniform_real_distribution<float> ur_a(-range, range);
  81       random_ns::uniform_real_distribution<float> ur_z(-z_range, z_range);
  82
  83       do
  84       {
  85          mp_t a1 = ur_a(rnd);
  86          mp_t b1 = ur_a(rnd);
  87          mp_t b2 = ur_a(rnd);
  88          mp_t z = ur_z(rnd);
  89
  90          arg1 = make_single_param(a1);
  91          arg2 = make_single_param(b1);
  92          arg3 = make_single_param(b2);
  93          arg4 = make_single_param(z);
  94          data.insert(hypergeometric_1f2_gen(), arg1, arg2, arg3, arg4);
  95       } while (num_spots--);
  96
  97       std::cout << "Any more data?";
  98       std::cin >> cont;
  99
 100    }
 101
 102
 103
 104    std::cout << "Enter name of test data file [default=hypergeometric_1f2.ipp]";
 105    std::getline(std::cin, line);
 106    boost::algorithm::trim(line);
 107    if(line == "")
 108       line = "hypergeometric_1f2.ipp";
 109    std::ofstream ofs(line.c_str());
 110    ofs << std::scientific << std::setprecision(40);
 111    write_code(ofs, data, line.c_str());
 112
 113    return 0;
 114 }
 115
 116