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

   1 //  (C) Copyright John Maddock 2007.
   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 #include "mp_t.hpp"
   7 #include <boost/math/special_functions/legendre.hpp>
   8 #include <boost/math/special_functions/gamma.hpp>
   9 #include <fstream>
  10 #include <boost/math/tools/test_data.hpp>
  11 #include <boost/random.hpp>
  12
  13 using namespace boost::math::tools;
  14 using namespace boost::math;
  15 using namespace std;
  16
  17
  18 template<class T>
  19 boost::math::tuple<T, T, T, T> legendre_p_data(T n, T x)
  20 {
  21    n = floor(n);
  22    T r1 = legendre_p(boost::math::tools::real_cast<int>(n), x);
  23    T r2 = legendre_q(boost::math::tools::real_cast<int>(n), x);
  24    return boost::math::make_tuple(n, x, r1, r2);
  25 }
  26
  27 template<class T>
  28 boost::math::tuple<T, T, T, T> assoc_legendre_p_data(T n, T x)
  29 {
  30    static boost::mt19937 r;
  31    int l = real_cast<int>(floor(n));
  32    boost::uniform_int<> ui((std::max)(-l, -40), (std::min)(l, 40));
  33    int m = ui(r);
  34    T r1 = legendre_p(l, m, x);
  35    return boost::math::make_tuple(n, m, x, r1);
  36 }
  37
  38 int main(int argc, char*argv [])
  39 {
  40    using namespace boost::math::tools;
  41
  42    parameter_info<mp_t> arg1, arg2;
  43    test_data<mp_t> data;
  44
  45    bool cont;
  46    std::string line;
  47
  48    if(argc < 1)
  49       return 1;
  50
  51    if(strcmp(argv[1], "--legendre2") == 0)
  52    {
  53       do{
  54          if(0 == get_user_parameter_info(arg1, "l"))
  55             return 1;
  56          if(0 == get_user_parameter_info(arg2, "x"))
  57             return 1;
  58          arg1.type |= dummy_param;
  59          arg2.type |= dummy_param;
  60
  61          data.insert(&legendre_p_data<mp_t>, arg1, arg2);
  62
  63          std::cout << "Any more data [y/n]?";
  64          std::getline(std::cin, line);
  65          boost::algorithm::trim(line);
  66          cont = (line == "y");
  67       }while(cont);
  68    }
  69    else if(strcmp(argv[1], "--legendre3") == 0)
  70    {
  71       do{
  72          if(0 == get_user_parameter_info(arg1, "l"))
  73             return 1;
  74          if(0 == get_user_parameter_info(arg2, "x"))
  75             return 1;
  76          arg1.type |= dummy_param;
  77          arg2.type |= dummy_param;
  78
  79          data.insert(&assoc_legendre_p_data<mp_t>, arg1, arg2);
  80
  81          std::cout << "Any more data [y/n]?";
  82          std::getline(std::cin, line);
  83          boost::algorithm::trim(line);
  84          cont = (line == "y");
  85       }while(cont);
  86    }
  87
  88
  89    std::cout << "Enter name of test data file [default=legendre_p.ipp]";
  90    std::getline(std::cin, line);
  91    boost::algorithm::trim(line);
  92    if(line == "")
  93       line = "legendre_p.ipp";
  94    std::ofstream ofs(line.c_str());
  95    ofs << std::scientific << std::setprecision(40);
  96    line.erase(line.find('.'));
  97    write_code(ofs, data, line.c_str());
  98
  99    return 0;
 100 }
 101