Question

我尝试使用boost的多精度从正态分布生成随机数。我可以从均匀分布中生成随机数，但是当我尝试从标准法线生成时，它会报告错误。这是代码：

（从Examples from boost开始，将mpz_int更改为cpp_int，将mpf_float_50更改为cpp_dec_float_50）

#include <boost/multiprecision/cpp_int.hpp>
#include <boost/multiprecision/cpp_dec_float.hpp>
#include <boost/multiprecision/random.hpp>
#include <boost/multiprecision/number.hpp>

int main()
{
   using namespace boost::multiprecision;
   using namespace boost::random;

   uniform_01<cpp_dec_float_50> uf;
   normal_distribution<cpp_dec_float_50> n01(0.0, 1.0);
   independent_bits_engine<mt19937, 50L*1000L/301L, cpp_int> gen;

   std::cout << std::setprecision(50);
   for(unsigned i = 0; i < 1; ++i) {
      std::cout << uf(gen) << std::endl;
      std::cout << n01(gen) << std::endl;
   }
   return 0;
}

但是，我可以从均匀分布中生成随机数，但是当我尝试从标准法线生成时，它会显示：

g ++ -I /〜/ boost / boost_1_58_0 -O0 -g3 -Wall -c -fmessage-length = 0 -MMD -MP -MF＆＃34; test_boost.d＆＃34; -MT＆＃34; test_boost.d＆＃34; -o＆＃34; test_boost.o＆＃34; ＆＃34; ../ test_boost.cpp＆＃34;

boost / boost_1_58_0 / boost / random / detail / uniform_int_float.hpp：63：错误：类型无效的static_cast 'boost :: multiprecision :: detail :: expression＆gt;，（boost :: multiprecision :: expression_template_option）1u＆gt ;, boost :: multiprecision :: number＆gt;，（boost :: multiprecision :: expression_template_option）1u＆gt;，void， void＆gt;'输入'long unsigned int'

我使用gcc版本4.4.7和64位linux系统。非常感谢你。

（我也尝试使用boost的例子来生成随机数，但我只是通过包含很多错误，例如： 错误：'struct boost :: multiprecision :: backends :: gmp_int'没有名为'data'的成员）

我稍微更改了代码：

#include <boost/multiprecision/random.hpp>
#include <boost/random.hpp>
#include <boost/multiprecision/cpp_int.hpp>
#include <boost/multiprecision/cpp_dec_float.hpp>

int main() {
    namespace mp = boost::multiprecision;

    boost::uniform_01<mp::cpp_dec_float_50> uf;
    boost::normal_distribution<mp::cpp_dec_float_50> n01(0.0, 1.0);

    boost::random::independent_bits_engine<boost::mt19937, 50L * 1000L / 301L, mp::number<mp::cpp_int::backend_type, mp::et_off> > gen;

    std::cout << std::setprecision(50);
    for (unsigned i = 0; i < 10; ++i) {
        std::cout << uf(gen) << std::endl;
        std::cout << n01(gen) << std::endl;
    }
    return 0;
}

以下是完整的错误消息：

****增量构建配置调试项目test_boost **** 做所有构建文件：../ test_boost.cpp 调用：交叉G ++编译器 g ++ -I /〜/ boost / boost_1_58_0 -O0 -g3 -Wall -c -fmessage-length = 0 -MMD -MP -MF＆＃34; test_boost.d＆＃34; -MT＆＃34; test_boost.d＆＃34; -o＆＃34; test_boost.o＆＃34; ＆＃34; ../ test_boost.cpp＆＃34;

来自

的文件

~/boost/boost_1_58_0/boost/random/uniform_int_distribution.hpp:29,

这

~/boost/boost_1_58_0/boost/random/random_number_generator.hpp:20,

来自

~/boost/boost_1_58_0/boost/random.hpp:54,

这

~/boost/boost_1_58_0/boost/multiprecision/random.hpp:31,

这

../test_boost.cpp:114:

〜/ boost / boost_1_58_0 / boost / random / detail / uniform_int_float.hpp：在成员函数中

‘typename boost::uint_t<((std::numeric_limits::digits < std::numeric_limits::digits) ? std::numeric_limits::digits :  std::numeric_limits::digits)>::fast boost::random::detail::uniform_int_float<URNG>::operator()() [with URNG = boost::random::independent_bits_engine<boost::random::mersenne_twister_engine<unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615u, 11ul, 4294967295u, 7ul, 2636928640u, 15ul, 4022730752u, 18ul, 1812433253u>, 166ul, boost::multiprecision::number<boost::multiprecision::backends::cpp_int_backend<0u, 0u, (boost::multiprecision::cpp_integer_type)1u, (boost::multiprecision::cpp_int_check_type)0u, std::allocator<unsigned int> >, (boost::multiprecision::expression_template_option)0u> >]’:

~/boost/boost_1_58_0/boost/random/uniform_int_distribution.hpp:67:   instantiated from ‘T boost::random::detail::generate_uniform_int(Engine&, T, T, mpl_::true_) [with Engine = boost::random::detail::uniform_int_float<boost::random::independent_bits_engine<boost::random::mersenne_twister_engine<unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615u, 11ul, 4294967295u, 7ul, 2636928640u, 15ul, 4022730752u, 18ul, 1812433253u>, 166ul, boost::multiprecision::number<boost::multiprecision::backends::cpp_int_backend<0u, 0u, (boost::multiprecision::cpp_integer_type)1u, (boost::multiprecision::cpp_int_check_type)0u, std::allocator<unsigned int> >, (boost::multiprecision::expression_template_option)0u> > >, T = int]’

~/boost/boost_1_58_0/boost/random/uniform_int_distribution.hpp:222:   instantiated from ‘T boost::random::detail::generate_uniform_int(Engine&, T, T, mpl_::false_) [with Engine = boost::random::independent_bits_engine<boost::random::mersenne_twister_engine<unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615u, 11ul, 4294967295u, 7ul, 2636928640u, 15ul, 4022730752u, 18ul, 1812433253u>, 166ul, boost::multiprecision::number<boost::multiprecision::backends::cpp_int_backend<0u, 0u, (boost::multiprecision::cpp_integer_type)1u, (boost::multiprecision::cpp_int_check_type)0u, std::allocator<unsigned int> >, (boost::multiprecision::expression_template_option)0u> >, T = int]’

~/boost/boost_1_58_0/boost/random/uniform_int_distribution.hpp:230:   instantiated from ‘T boost::random::detail::generate_uniform_int(Engine&, T, T) [with Engine = boost::random::independent_bits_engine<boost::random::mersenne_twister_engine<unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615u, 11ul, 4294967295u, 7ul, 2636928640u, 15ul, 4022730752u, 18ul, 1812433253u>, 166ul, boost::multiprecision::number<boost::multiprecision::backends::cpp_int_backend<0u, 0u, (boost::multiprecision::cpp_integer_type)1u, (boost::multiprecision::cpp_int_check_type)0u, std::allocator<unsigned int> >, (boost::multiprecision::expression_template_option)0u> >, T = int]’

~/boost/boost_1_58_0/boost/random/uniform_int_distribution.hpp:353:   instantiated from ‘IntType boost::random::uniform_int_distribution<IntType>::operator()(Engine&) const [with Engine = boost::random::independent_bits_engine<boost::random::mersenne_twister_engine<unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615u, 11ul, 4294967295u, 7ul, 2636928640u, 15ul, 4022730752u, 18ul, 1812433253u>, 166ul, boost::multiprecision::number<boost::multiprecision::backends::cpp_int_backend<0u, 0u, (boost::multiprecision::cpp_integer_type)1u, (boost::multiprecision::cpp_int_check_type)0u, std::allocator<unsigned int> >, (boost::multiprecision::expression_template_option)0u> >, IntType = int]’

~/boost/boost_1_58_0/boost/random/normal_distribution.hpp:195:   instantiated from ‘std::pair<RealType, int> boost::random::detail::generate_int_float_pair(Engine&, mpl_::false_) [with RealType = boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<50u, int, void>, (boost::multiprecision::expression_template_option)1u>, long unsigned int w = 8ul, Engine = boost::random::independent_bits_engine<boost::random::mersenne_twister_engine<unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615u, 11ul, 4294967295u, 7ul, 2636928640u, 15ul, 4022730752u, 18ul, 1812433253u>, 166ul, boost::multiprecision::number<boost::multiprecision::backends::cpp_int_backend<0u, 0u, (boost::multiprecision::cpp_integer_type)1u, (boost::multiprecision::cpp_int_check_type)0u, std::allocator<unsigned int> >, (boost::multiprecision::expression_template_option)0u> >]’

~/boost/boost_1_58_0/boost/random/normal_distribution.hpp:205:   instantiated from ‘std::pair<RealType, int> boost::random::detail::generate_int_float_pair(Engine&) [with RealType = boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<50u, int, void>, (boost::multiprecision::expression_template_option)1u>, long unsigned int w = 8ul, Engine = boost::random::independent_bits_engine<boost::random::mersenne_twister_engine<unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615u, 11ul, 4294967295u, 7ul, 2636928640u, 15ul, 4022730752u, 18ul, 1812433253u>, 166ul, boost::multiprecision::number<boost::multiprecision::backends::cpp_int_backend<0u, 0u, (boost::multiprecision::cpp_integer_type)1u, (boost::multiprecision::cpp_int_check_type)0u, std::allocator<unsigned int> >, (boost::multiprecision::expression_template_option)0u> >]’

~/boost/boost_1_58_0/boost/random/normal_distribution.hpp:216:   instantiated from ‘RealType `boost::random::detail::unit_normal_distribution<RealType>::operator()(Engine&) [with Engine = boost::random::independent_bits_engine<boost::random::mersenne_twister_engine<unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615u, 11ul, 4294967295u, 7ul, 2636928640u, 15ul, 4022730752u, 18ul, 1812433253u>, 166ul, boost::multiprecision::number<boost::multiprecision::backends::cpp_int_backend<0u, 0u, (boost::multiprecision::cpp_integer_type)1u, (boost::multiprecision::cpp_int_check_type)0u, std::allocator<unsigned int> >, (boost::multiprecision::expression_template_option)0u> >, RealType = boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<50u, int, void>, (boost::multiprecision::expression_template_option)1u>]’`

~/boost/boost_1_58_0/boost/random/normal_distribution.hpp:357:   instantiated from ‘RealType `boost::random::normal_distribution<RealType>::operator()(Engine&) [with Engine = boost::random::independent_bits_engine<boost::random::mersenne_twister_engine<unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615u, 11ul, 4294967295u, 7ul, 2636928640u, 15ul, 4022730752u, 18ul, 1812433253u>, 166ul, boost::multiprecision::number<boost::multiprecision::backends::cpp_int_backend<0u, 0u, (boost::multiprecision::cpp_integer_type)1u, (boost::multiprecision::cpp_int_check_type)0u, std::allocator<unsigned int> >, (boost::multiprecision::expression_template_option)0u> >, RealType = boost::multiprecision::number<boost::multiprecision::backends::cpp_dec_float<50u, int, void>, (boost::multiprecision::expression_template_option)1u>]’`

../ test_boost.cpp：135：从这里实例化

〜/ boost / boost_1_58_0 / boost / random / detail / uniform_int_float.hpp：63：错误：类型无效的static_cast ‘boost::multiprecision::number<boost::multiprecision::backends::cpp_int_backend<0u, 0u, (boost::multiprecision::cpp_integer_type)1u, (boost::multiprecision::cpp_int_check_type)0u, std::allocator<unsigned int> >, (boost::multiprecision::expression_template_option)0u>’ to type ‘long unsigned int’

make：*** [test_boost.o]错误1

17:21:45构建完成（耗时910毫秒）

Answer 1

一些棘手的问题：

包含顺序很重要（Using Boost.Random to generate multiprecision integers from a seed）
并且您应该将belongs_to参数的表达式模板禁用为cpp_int。

<强> Live On Coliru

independent_bits

打印例如。

#include <boost/multiprecision/random.hpp>
#include <boost/random.hpp>
#include <boost/multiprecision/cpp_int.hpp>
#include <boost/multiprecision/cpp_dec_float.hpp>
#include <boost/multiprecision/number.hpp>

int main() {
    namespace mp = boost::multiprecision;

    boost::uniform_01<mp::cpp_dec_float_50> uf;
    boost::normal_distribution<mp::cpp_dec_float_50> n01(0.0, 1.0);

    boost::random::independent_bits_engine<boost::mt19937, 50L * 1000L / 301L, mp::number<mp::cpp_int::backend_type, mp::et_off> > gen;

    std::cout << std::setprecision(50);
    for (unsigned i = 0; i < 10; ++i) {
        std::cout << uf(gen) << std::endl;
        std::cout << n01(gen) << std::endl;
    }
    return 0;
}

如何使用boost multiprecision生成正态随机数？

1 个答案: