| // Copyright John Maddock 2008. |
| // 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) |
| // |
| // Wrapper that works with mpfr_class defined in gmpfrxx.h |
| // See http://math.berkeley.edu/~wilken/code/gmpfrxx/ |
| // Also requires the gmp and mpfr libraries. |
| // |
| |
| #ifndef BOOST_MATH_E_FLOAT_BINDINGS_HPP |
| #define BOOST_MATH_E_FLOAT_BINDINGS_HPP |
| |
| #include <boost/config.hpp> |
| |
| |
| #include <e_float/e_float.h> |
| #include <functions/functions.h> |
| |
| #include <boost/math/tools/precision.hpp> |
| #include <boost/math/tools/real_cast.hpp> |
| #include <boost/math/policies/policy.hpp> |
| #include <boost/math/distributions/fwd.hpp> |
| #include <boost/math/special_functions/math_fwd.hpp> |
| #include <boost/math/special_functions/fpclassify.hpp> |
| #include <boost/math/bindings/detail/big_digamma.hpp> |
| #include <boost/math/bindings/detail/big_lanczos.hpp> |
| |
| |
| namespace boost{ namespace math{ namespace ef{ |
| |
| class e_float |
| { |
| public: |
| // Constructors: |
| e_float() {} |
| e_float(const ::e_float& c) : m_value(c){} |
| e_float(char c) |
| { |
| m_value = ::e_float(c); |
| } |
| #ifndef BOOST_NO_INTRINSIC_WCHAR_T |
| e_float(wchar_t c) |
| { |
| m_value = ::e_float(c); |
| } |
| #endif |
| e_float(unsigned char c) |
| { |
| m_value = ::e_float(c); |
| } |
| e_float(signed char c) |
| { |
| m_value = ::e_float(c); |
| } |
| e_float(unsigned short c) |
| { |
| m_value = ::e_float(c); |
| } |
| e_float(short c) |
| { |
| m_value = ::e_float(c); |
| } |
| e_float(unsigned int c) |
| { |
| m_value = ::e_float(c); |
| } |
| e_float(int c) |
| { |
| m_value = ::e_float(c); |
| } |
| e_float(unsigned long c) |
| { |
| m_value = ::e_float((UINT64)c); |
| } |
| e_float(long c) |
| { |
| m_value = ::e_float((INT64)c); |
| } |
| #ifdef BOOST_HAS_LONG_LONG |
| e_float(boost::ulong_long_type c) |
| { |
| m_value = ::e_float(c); |
| } |
| e_float(boost::long_long_type c) |
| { |
| m_value = ::e_float(c); |
| } |
| #endif |
| e_float(float c) |
| { |
| assign_large_real(c); |
| } |
| e_float(double c) |
| { |
| assign_large_real(c); |
| } |
| e_float(long double c) |
| { |
| assign_large_real(c); |
| } |
| |
| // Assignment: |
| e_float& operator=(char c) { m_value = ::e_float(c); return *this; } |
| e_float& operator=(unsigned char c) { m_value = ::e_float(c); return *this; } |
| e_float& operator=(signed char c) { m_value = ::e_float(c); return *this; } |
| #ifndef BOOST_NO_INTRINSIC_WCHAR_T |
| e_float& operator=(wchar_t c) { m_value = ::e_float(c); return *this; } |
| #endif |
| e_float& operator=(short c) { m_value = ::e_float(c); return *this; } |
| e_float& operator=(unsigned short c) { m_value = ::e_float(c); return *this; } |
| e_float& operator=(int c) { m_value = ::e_float(c); return *this; } |
| e_float& operator=(unsigned int c) { m_value = ::e_float(c); return *this; } |
| e_float& operator=(long c) { m_value = ::e_float((INT64)c); return *this; } |
| e_float& operator=(unsigned long c) { m_value = ::e_float((UINT64)c); return *this; } |
| #ifdef BOOST_HAS_LONG_LONG |
| e_float& operator=(boost::long_long_type c) { m_value = ::e_float(c); return *this; } |
| e_float& operator=(boost::ulong_long_type c) { m_value = ::e_float(c); return *this; } |
| #endif |
| e_float& operator=(float c) { assign_large_real(c); return *this; } |
| e_float& operator=(double c) { assign_large_real(c); return *this; } |
| e_float& operator=(long double c) { assign_large_real(c); return *this; } |
| |
| // Access: |
| ::e_float& value(){ return m_value; } |
| ::e_float const& value()const{ return m_value; } |
| |
| // Member arithmetic: |
| e_float& operator+=(const e_float& other) |
| { m_value += other.value(); return *this; } |
| e_float& operator-=(const e_float& other) |
| { m_value -= other.value(); return *this; } |
| e_float& operator*=(const e_float& other) |
| { m_value *= other.value(); return *this; } |
| e_float& operator/=(const e_float& other) |
| { m_value /= other.value(); return *this; } |
| e_float operator-()const |
| { return -m_value; } |
| e_float const& operator+()const |
| { return *this; } |
| |
| private: |
| ::e_float m_value; |
| |
| template <class V> |
| void assign_large_real(const V& a) |
| { |
| using std::frexp; |
| using std::ldexp; |
| using std::floor; |
| if (a == 0) { |
| m_value = ::ef::zero(); |
| return; |
| } |
| |
| if (a == 1) { |
| m_value = ::ef::one(); |
| return; |
| } |
| |
| if ((boost::math::isinf)(a)) |
| { |
| m_value = a > 0 ? m_value.my_value_inf() : -m_value.my_value_inf(); |
| return; |
| } |
| if((boost::math::isnan)(a)) |
| { |
| m_value = m_value.my_value_nan(); |
| return; |
| } |
| |
| int e; |
| long double f, term; |
| ::e_float t; |
| m_value = ::ef::zero(); |
| |
| f = frexp(a, &e); |
| |
| ::e_float shift = ::ef::pow2(30); |
| |
| while(f) |
| { |
| // extract 30 bits from f: |
| f = ldexp(f, 30); |
| term = floor(f); |
| e -= 30; |
| m_value *= shift; |
| m_value += ::e_float(static_cast<UINT64>(term)); |
| f -= term; |
| } |
| m_value *= ::ef::pow2(e); |
| } |
| }; |
| |
| |
| // Non-member arithmetic: |
| inline e_float operator+(const e_float& a, const e_float& b) |
| { |
| e_float result(a); |
| result += b; |
| return result; |
| } |
| inline e_float operator-(const e_float& a, const e_float& b) |
| { |
| e_float result(a); |
| result -= b; |
| return result; |
| } |
| inline e_float operator*(const e_float& a, const e_float& b) |
| { |
| e_float result(a); |
| result *= b; |
| return result; |
| } |
| inline e_float operator/(const e_float& a, const e_float& b) |
| { |
| e_float result(a); |
| result /= b; |
| return result; |
| } |
| |
| // Comparison: |
| inline bool operator == (const e_float& a, const e_float& b) |
| { return a.value() == b.value() ? true : false; } |
| inline bool operator != (const e_float& a, const e_float& b) |
| { return a.value() != b.value() ? true : false;} |
| inline bool operator < (const e_float& a, const e_float& b) |
| { return a.value() < b.value() ? true : false; } |
| inline bool operator <= (const e_float& a, const e_float& b) |
| { return a.value() <= b.value() ? true : false; } |
| inline bool operator > (const e_float& a, const e_float& b) |
| { return a.value() > b.value() ? true : false; } |
| inline bool operator >= (const e_float& a, const e_float& b) |
| { return a.value() >= b.value() ? true : false; } |
| |
| std::istream& operator >> (std::istream& is, e_float& f) |
| { |
| return is >> f.value(); |
| } |
| |
| std::ostream& operator << (std::ostream& os, const e_float& f) |
| { |
| return os << f.value(); |
| } |
| |
| inline e_float fabs(const e_float& v) |
| { |
| return ::ef::fabs(v.value()); |
| } |
| |
| inline e_float abs(const e_float& v) |
| { |
| return ::ef::fabs(v.value()); |
| } |
| |
| inline e_float floor(const e_float& v) |
| { |
| return ::ef::floor(v.value()); |
| } |
| |
| inline e_float ceil(const e_float& v) |
| { |
| return ::ef::ceil(v.value()); |
| } |
| |
| inline e_float pow(const e_float& v, const e_float& w) |
| { |
| return ::ef::pow(v.value(), w.value()); |
| } |
| |
| inline e_float pow(const e_float& v, int i) |
| { |
| return ::ef::pow(v.value(), ::e_float(i)); |
| } |
| |
| inline e_float exp(const e_float& v) |
| { |
| return ::ef::exp(v.value()); |
| } |
| |
| inline e_float log(const e_float& v) |
| { |
| return ::ef::log(v.value()); |
| } |
| |
| inline e_float sqrt(const e_float& v) |
| { |
| return ::ef::sqrt(v.value()); |
| } |
| |
| inline e_float sin(const e_float& v) |
| { |
| return ::ef::sin(v.value()); |
| } |
| |
| inline e_float cos(const e_float& v) |
| { |
| return ::ef::cos(v.value()); |
| } |
| |
| inline e_float tan(const e_float& v) |
| { |
| return ::ef::tan(v.value()); |
| } |
| |
| inline e_float acos(const e_float& v) |
| { |
| return ::ef::acos(v.value()); |
| } |
| |
| inline e_float asin(const e_float& v) |
| { |
| return ::ef::asin(v.value()); |
| } |
| |
| inline e_float atan(const e_float& v) |
| { |
| return ::ef::atan(v.value()); |
| } |
| |
| inline e_float ldexp(const e_float& v, int e) |
| { |
| return v.value() * ::ef::pow2(e); |
| } |
| |
| inline e_float frexp(const e_float& v, int* expon) |
| { |
| double d; |
| INT64 i; |
| v.value().extract_parts(d, i); |
| *expon = static_cast<int>(i); |
| return v.value() * ::ef::pow2(-i); |
| } |
| |
| inline e_float sinh (const e_float& x) |
| { |
| return ::ef::sinh(x.value()); |
| } |
| |
| inline e_float cosh (const e_float& x) |
| { |
| return ::ef::cosh(x.value()); |
| } |
| |
| inline e_float tanh (const e_float& x) |
| { |
| return ::ef::tanh(x.value()); |
| } |
| |
| inline e_float asinh (const e_float& x) |
| { |
| return ::ef::asinh(x.value()); |
| } |
| |
| inline e_float acosh (const e_float& x) |
| { |
| return ::ef::acosh(x.value()); |
| } |
| |
| inline e_float atanh (const e_float& x) |
| { |
| return ::ef::atanh(x.value()); |
| } |
| |
| e_float fmod(const e_float& v1, const e_float& v2) |
| { |
| e_float n; |
| if(v1 < 0) |
| n = ceil(v1 / v2); |
| else |
| n = floor(v1 / v2); |
| return v1 - n * v2; |
| } |
| |
| } namespace detail{ |
| |
| template <> |
| inline int fpclassify_imp< boost::math::ef::e_float> BOOST_NO_MACRO_EXPAND(boost::math::ef::e_float x, const generic_tag<true>&) |
| { |
| if(x.value().isnan()) |
| return FP_NAN; |
| if(x.value().isinf()) |
| return FP_INFINITE; |
| if(x == 0) |
| return FP_ZERO; |
| return FP_NORMAL; |
| } |
| |
| } namespace ef{ |
| |
| template <class Policy> |
| inline int itrunc(const e_float& v, const Policy& pol) |
| { |
| BOOST_MATH_STD_USING |
| e_float r = boost::math::trunc(v, pol); |
| if(fabs(r) > (std::numeric_limits<int>::max)()) |
| return static_cast<int>(policies::raise_rounding_error("boost::math::itrunc<%1%>(%1%)", 0, 0, v, pol)); |
| return static_cast<int>(r.value().extract_int64()); |
| } |
| |
| template <class Policy> |
| inline long ltrunc(const e_float& v, const Policy& pol) |
| { |
| BOOST_MATH_STD_USING |
| e_float r = boost::math::trunc(v, pol); |
| if(fabs(r) > (std::numeric_limits<long>::max)()) |
| return static_cast<long>(policies::raise_rounding_error("boost::math::ltrunc<%1%>(%1%)", 0, 0L, v, pol)); |
| return static_cast<long>(r.value().extract_int64()); |
| } |
| |
| #ifdef BOOST_HAS_LONG_LONG |
| template <class Policy> |
| inline boost::long_long_type lltrunc(const e_float& v, const Policy& pol) |
| { |
| BOOST_MATH_STD_USING |
| e_float r = boost::math::trunc(v, pol); |
| if(fabs(r) > (std::numeric_limits<boost::long_long_type>::max)()) |
| return static_cast<boost::long_long_type>(policies::raise_rounding_error("boost::math::lltrunc<%1%>(%1%)", 0, v, 0LL, pol).value().extract_int64()); |
| return static_cast<boost::long_long_type>(r.value().extract_int64()); |
| } |
| #endif |
| |
| template <class Policy> |
| inline int iround(const e_float& v, const Policy& pol) |
| { |
| BOOST_MATH_STD_USING |
| e_float r = boost::math::round(v, pol); |
| if(fabs(r) > (std::numeric_limits<int>::max)()) |
| return static_cast<int>(policies::raise_rounding_error("boost::math::iround<%1%>(%1%)", 0, v, 0, pol).value().extract_int64()); |
| return static_cast<int>(r.value().extract_int64()); |
| } |
| |
| template <class Policy> |
| inline long lround(const e_float& v, const Policy& pol) |
| { |
| BOOST_MATH_STD_USING |
| e_float r = boost::math::round(v, pol); |
| if(fabs(r) > (std::numeric_limits<long>::max)()) |
| return static_cast<long int>(policies::raise_rounding_error("boost::math::lround<%1%>(%1%)", 0, v, 0L, pol).value().extract_int64()); |
| return static_cast<long int>(r.value().extract_int64()); |
| } |
| |
| #ifdef BOOST_HAS_LONG_LONG |
| template <class Policy> |
| inline boost::long_long_type llround(const e_float& v, const Policy& pol) |
| { |
| BOOST_MATH_STD_USING |
| e_float r = boost::math::round(v, pol); |
| if(fabs(r) > (std::numeric_limits<boost::long_long_type>::max)()) |
| return static_cast<boost::long_long_type>(policies::raise_rounding_error("boost::math::llround<%1%>(%1%)", 0, v, 0LL, pol).value().extract_int64()); |
| return static_cast<boost::long_long_type>(r.value().extract_int64()); |
| } |
| #endif |
| |
| }}} |
| |
| namespace std{ |
| |
| template<> |
| class numeric_limits< ::boost::math::ef::e_float> : public numeric_limits< ::e_float> |
| { |
| public: |
| static const ::boost::math::ef::e_float (min) (void) |
| { |
| return (numeric_limits< ::e_float>::min)(); |
| } |
| static const ::boost::math::ef::e_float (max) (void) |
| { |
| return (numeric_limits< ::e_float>::max)(); |
| } |
| static const ::boost::math::ef::e_float epsilon (void) |
| { |
| return (numeric_limits< ::e_float>::epsilon)(); |
| } |
| static const ::boost::math::ef::e_float round_error(void) |
| { |
| return (numeric_limits< ::e_float>::round_error)(); |
| } |
| static const ::boost::math::ef::e_float infinity (void) |
| { |
| return (numeric_limits< ::e_float>::infinity)(); |
| } |
| static const ::boost::math::ef::e_float quiet_NaN (void) |
| { |
| return (numeric_limits< ::e_float>::quiet_NaN)(); |
| } |
| // |
| // e_float's supplied digits member is wrong |
| // - it should be same the same as digits 10 |
| // - given that radix is 10. |
| // |
| static const int digits = digits10; |
| }; |
| |
| } // namespace std |
| |
| namespace boost{ namespace math{ |
| |
| namespace policies{ |
| |
| template <class Policy> |
| struct precision< ::boost::math::ef::e_float, Policy> |
| { |
| typedef typename Policy::precision_type precision_type; |
| typedef digits2<((::std::numeric_limits< ::boost::math::ef::e_float>::digits10 + 1) * 1000L) / 301L> digits_2; |
| typedef typename mpl::if_c< |
| ((digits_2::value <= precision_type::value) |
| || (Policy::precision_type::value <= 0)), |
| // Default case, full precision for RealType: |
| digits_2, |
| // User customised precision: |
| precision_type |
| >::type type; |
| }; |
| |
| } |
| |
| namespace tools{ |
| |
| template <> |
| inline int digits< ::boost::math::ef::e_float>(BOOST_MATH_EXPLICIT_TEMPLATE_TYPE_SPEC( ::boost::math::ef::e_float)) |
| { |
| return ((::std::numeric_limits< ::boost::math::ef::e_float>::digits10 + 1) * 1000L) / 301L; |
| } |
| |
| template <> |
| inline ::boost::math::ef::e_float root_epsilon< ::boost::math::ef::e_float>() |
| { |
| return detail::root_epsilon_imp(static_cast< ::boost::math::ef::e_float const*>(0), mpl::int_<0>()); |
| } |
| |
| template <> |
| inline ::boost::math::ef::e_float forth_root_epsilon< ::boost::math::ef::e_float>() |
| { |
| return detail::forth_root_epsilon_imp(static_cast< ::boost::math::ef::e_float const*>(0), mpl::int_<0>()); |
| } |
| |
| } |
| |
| namespace lanczos{ |
| |
| template<class Policy> |
| struct lanczos<boost::math::ef::e_float, Policy> |
| { |
| typedef typename mpl::if_c< |
| std::numeric_limits< ::e_float>::digits10 < 22, |
| lanczos13UDT, |
| typename mpl::if_c< |
| std::numeric_limits< ::e_float>::digits10 < 36, |
| lanczos22UDT, |
| typename mpl::if_c< |
| std::numeric_limits< ::e_float>::digits10 < 50, |
| lanczos31UDT, |
| typename mpl::if_c< |
| std::numeric_limits< ::e_float>::digits10 < 110, |
| lanczos61UDT, |
| undefined_lanczos |
| >::type |
| >::type |
| >::type |
| >::type type; |
| }; |
| |
| } // namespace lanczos |
| |
| template <class Policy> |
| inline boost::math::ef::e_float skewness(const extreme_value_distribution<boost::math::ef::e_float, Policy>& /*dist*/) |
| { |
| // |
| // This is 12 * sqrt(6) * zeta(3) / pi^3: |
| // See http://mathworld.wolfram.com/ExtremeValueDistribution.html |
| // |
| return boost::lexical_cast<boost::math::ef::e_float>("1.1395470994046486574927930193898461120875997958366"); |
| } |
| |
| template <class Policy> |
| inline boost::math::ef::e_float skewness(const rayleigh_distribution<boost::math::ef::e_float, Policy>& /*dist*/) |
| { |
| // using namespace boost::math::constants; |
| return boost::lexical_cast<boost::math::ef::e_float>("0.63111065781893713819189935154422777984404221106391"); |
| // Computed using NTL at 150 bit, about 50 decimal digits. |
| // return 2 * root_pi<RealType>() * pi_minus_three<RealType>() / pow23_four_minus_pi<RealType>(); |
| } |
| |
| template <class Policy> |
| inline boost::math::ef::e_float kurtosis(const rayleigh_distribution<boost::math::ef::e_float, Policy>& /*dist*/) |
| { |
| // using namespace boost::math::constants; |
| return boost::lexical_cast<boost::math::ef::e_float>("3.2450893006876380628486604106197544154170667057995"); |
| // Computed using NTL at 150 bit, about 50 decimal digits. |
| // return 3 - (6 * pi<RealType>() * pi<RealType>() - 24 * pi<RealType>() + 16) / |
| // (four_minus_pi<RealType>() * four_minus_pi<RealType>()); |
| } |
| |
| template <class Policy> |
| inline boost::math::ef::e_float kurtosis_excess(const rayleigh_distribution<boost::math::ef::e_float, Policy>& /*dist*/) |
| { |
| //using namespace boost::math::constants; |
| // Computed using NTL at 150 bit, about 50 decimal digits. |
| return boost::lexical_cast<boost::math::ef::e_float>("0.2450893006876380628486604106197544154170667057995"); |
| // return -(6 * pi<RealType>() * pi<RealType>() - 24 * pi<RealType>() + 16) / |
| // (four_minus_pi<RealType>() * four_minus_pi<RealType>()); |
| } // kurtosis |
| |
| namespace detail{ |
| |
| // |
| // Version of Digamma accurate to ~100 decimal digits. |
| // |
| template <class Policy> |
| boost::math::ef::e_float digamma_imp(boost::math::ef::e_float x, const mpl::int_<0>* , const Policy& pol) |
| { |
| // |
| // This handles reflection of negative arguments, and all our |
| // eboost::math::ef::e_floator handling, then forwards to the T-specific approximation. |
| // |
| BOOST_MATH_STD_USING // ADL of std functions. |
| |
| boost::math::ef::e_float result = 0; |
| // |
| // Check for negative arguments and use reflection: |
| // |
| if(x < 0) |
| { |
| // Reflect: |
| x = 1 - x; |
| // Argument reduction for tan: |
| boost::math::ef::e_float remainder = x - floor(x); |
| // Shift to negative if > 0.5: |
| if(remainder > 0.5) |
| { |
| remainder -= 1; |
| } |
| // |
| // check for evaluation at a negative pole: |
| // |
| if(remainder == 0) |
| { |
| return policies::raise_pole_error<boost::math::ef::e_float>("boost::math::digamma<%1%>(%1%)", 0, (1-x), pol); |
| } |
| result = constants::pi<boost::math::ef::e_float>() / tan(constants::pi<boost::math::ef::e_float>() * remainder); |
| } |
| result += big_digamma(x); |
| return result; |
| } |
| boost::math::ef::e_float bessel_i0(boost::math::ef::e_float x) |
| { |
| static const boost::math::ef::e_float P1[] = { |
| boost::lexical_cast<boost::math::ef::e_float>("-2.2335582639474375249e+15"), |
| boost::lexical_cast<boost::math::ef::e_float>("-5.5050369673018427753e+14"), |
| boost::lexical_cast<boost::math::ef::e_float>("-3.2940087627407749166e+13"), |
| boost::lexical_cast<boost::math::ef::e_float>("-8.4925101247114157499e+11"), |
| boost::lexical_cast<boost::math::ef::e_float>("-1.1912746104985237192e+10"), |
| boost::lexical_cast<boost::math::ef::e_float>("-1.0313066708737980747e+08"), |
| boost::lexical_cast<boost::math::ef::e_float>("-5.9545626019847898221e+05"), |
| boost::lexical_cast<boost::math::ef::e_float>("-2.4125195876041896775e+03"), |
| boost::lexical_cast<boost::math::ef::e_float>("-7.0935347449210549190e+00"), |
| boost::lexical_cast<boost::math::ef::e_float>("-1.5453977791786851041e-02"), |
| boost::lexical_cast<boost::math::ef::e_float>("-2.5172644670688975051e-05"), |
| boost::lexical_cast<boost::math::ef::e_float>("-3.0517226450451067446e-08"), |
| boost::lexical_cast<boost::math::ef::e_float>("-2.6843448573468483278e-11"), |
| boost::lexical_cast<boost::math::ef::e_float>("-1.5982226675653184646e-14"), |
| boost::lexical_cast<boost::math::ef::e_float>("-5.2487866627945699800e-18"), |
| }; |
| static const boost::math::ef::e_float Q1[] = { |
| boost::lexical_cast<boost::math::ef::e_float>("-2.2335582639474375245e+15"), |
| boost::lexical_cast<boost::math::ef::e_float>("7.8858692566751002988e+12"), |
| boost::lexical_cast<boost::math::ef::e_float>("-1.2207067397808979846e+10"), |
| boost::lexical_cast<boost::math::ef::e_float>("1.0377081058062166144e+07"), |
| boost::lexical_cast<boost::math::ef::e_float>("-4.8527560179962773045e+03"), |
| boost::lexical_cast<boost::math::ef::e_float>("1.0"), |
| }; |
| static const boost::math::ef::e_float P2[] = { |
| boost::lexical_cast<boost::math::ef::e_float>("-2.2210262233306573296e-04"), |
| boost::lexical_cast<boost::math::ef::e_float>("1.3067392038106924055e-02"), |
| boost::lexical_cast<boost::math::ef::e_float>("-4.4700805721174453923e-01"), |
| boost::lexical_cast<boost::math::ef::e_float>("5.5674518371240761397e+00"), |
| boost::lexical_cast<boost::math::ef::e_float>("-2.3517945679239481621e+01"), |
| boost::lexical_cast<boost::math::ef::e_float>("3.1611322818701131207e+01"), |
| boost::lexical_cast<boost::math::ef::e_float>("-9.6090021968656180000e+00"), |
| }; |
| static const boost::math::ef::e_float Q2[] = { |
| boost::lexical_cast<boost::math::ef::e_float>("-5.5194330231005480228e-04"), |
| boost::lexical_cast<boost::math::ef::e_float>("3.2547697594819615062e-02"), |
| boost::lexical_cast<boost::math::ef::e_float>("-1.1151759188741312645e+00"), |
| boost::lexical_cast<boost::math::ef::e_float>("1.3982595353892851542e+01"), |
| boost::lexical_cast<boost::math::ef::e_float>("-6.0228002066743340583e+01"), |
| boost::lexical_cast<boost::math::ef::e_float>("8.5539563258012929600e+01"), |
| boost::lexical_cast<boost::math::ef::e_float>("-3.1446690275135491500e+01"), |
| boost::lexical_cast<boost::math::ef::e_float>("1.0"), |
| }; |
| boost::math::ef::e_float value, factor, r; |
| |
| BOOST_MATH_STD_USING |
| using namespace boost::math::tools; |
| |
| if (x < 0) |
| { |
| x = -x; // even function |
| } |
| if (x == 0) |
| { |
| return static_cast<boost::math::ef::e_float>(1); |
| } |
| if (x <= 15) // x in (0, 15] |
| { |
| boost::math::ef::e_float y = x * x; |
| value = evaluate_polynomial(P1, y) / evaluate_polynomial(Q1, y); |
| } |
| else // x in (15, \infty) |
| { |
| boost::math::ef::e_float y = 1 / x - 1 / 15; |
| r = evaluate_polynomial(P2, y) / evaluate_polynomial(Q2, y); |
| factor = exp(x) / sqrt(x); |
| value = factor * r; |
| } |
| |
| return value; |
| } |
| |
| boost::math::ef::e_float bessel_i1(boost::math::ef::e_float x) |
| { |
| static const boost::math::ef::e_float P1[] = { |
| lexical_cast<boost::math::ef::e_float>("-1.4577180278143463643e+15"), |
| lexical_cast<boost::math::ef::e_float>("-1.7732037840791591320e+14"), |
| lexical_cast<boost::math::ef::e_float>("-6.9876779648010090070e+12"), |
| lexical_cast<boost::math::ef::e_float>("-1.3357437682275493024e+11"), |
| lexical_cast<boost::math::ef::e_float>("-1.4828267606612366099e+09"), |
| lexical_cast<boost::math::ef::e_float>("-1.0588550724769347106e+07"), |
| lexical_cast<boost::math::ef::e_float>("-5.1894091982308017540e+04"), |
| lexical_cast<boost::math::ef::e_float>("-1.8225946631657315931e+02"), |
| lexical_cast<boost::math::ef::e_float>("-4.7207090827310162436e-01"), |
| lexical_cast<boost::math::ef::e_float>("-9.1746443287817501309e-04"), |
| lexical_cast<boost::math::ef::e_float>("-1.3466829827635152875e-06"), |
| lexical_cast<boost::math::ef::e_float>("-1.4831904935994647675e-09"), |
| lexical_cast<boost::math::ef::e_float>("-1.1928788903603238754e-12"), |
| lexical_cast<boost::math::ef::e_float>("-6.5245515583151902910e-16"), |
| lexical_cast<boost::math::ef::e_float>("-1.9705291802535139930e-19"), |
| }; |
| static const boost::math::ef::e_float Q1[] = { |
| lexical_cast<boost::math::ef::e_float>("-2.9154360556286927285e+15"), |
| lexical_cast<boost::math::ef::e_float>("9.7887501377547640438e+12"), |
| lexical_cast<boost::math::ef::e_float>("-1.4386907088588283434e+10"), |
| lexical_cast<boost::math::ef::e_float>("1.1594225856856884006e+07"), |
| lexical_cast<boost::math::ef::e_float>("-5.1326864679904189920e+03"), |
| lexical_cast<boost::math::ef::e_float>("1.0"), |
| }; |
| static const boost::math::ef::e_float P2[] = { |
| lexical_cast<boost::math::ef::e_float>("1.4582087408985668208e-05"), |
| lexical_cast<boost::math::ef::e_float>("-8.9359825138577646443e-04"), |
| lexical_cast<boost::math::ef::e_float>("2.9204895411257790122e-02"), |
| lexical_cast<boost::math::ef::e_float>("-3.4198728018058047439e-01"), |
| lexical_cast<boost::math::ef::e_float>("1.3960118277609544334e+00"), |
| lexical_cast<boost::math::ef::e_float>("-1.9746376087200685843e+00"), |
| lexical_cast<boost::math::ef::e_float>("8.5591872901933459000e-01"), |
| lexical_cast<boost::math::ef::e_float>("-6.0437159056137599999e-02"), |
| }; |
| static const boost::math::ef::e_float Q2[] = { |
| lexical_cast<boost::math::ef::e_float>("3.7510433111922824643e-05"), |
| lexical_cast<boost::math::ef::e_float>("-2.2835624489492512649e-03"), |
| lexical_cast<boost::math::ef::e_float>("7.4212010813186530069e-02"), |
| lexical_cast<boost::math::ef::e_float>("-8.5017476463217924408e-01"), |
| lexical_cast<boost::math::ef::e_float>("3.2593714889036996297e+00"), |
| lexical_cast<boost::math::ef::e_float>("-3.8806586721556593450e+00"), |
| lexical_cast<boost::math::ef::e_float>("1.0"), |
| }; |
| boost::math::ef::e_float value, factor, r, w; |
| |
| BOOST_MATH_STD_USING |
| using namespace boost::math::tools; |
| |
| w = abs(x); |
| if (x == 0) |
| { |
| return static_cast<boost::math::ef::e_float>(0); |
| } |
| if (w <= 15) // w in (0, 15] |
| { |
| boost::math::ef::e_float y = x * x; |
| r = evaluate_polynomial(P1, y) / evaluate_polynomial(Q1, y); |
| factor = w; |
| value = factor * r; |
| } |
| else // w in (15, \infty) |
| { |
| boost::math::ef::e_float y = 1 / w - boost::math::ef::e_float(1) / 15; |
| r = evaluate_polynomial(P2, y) / evaluate_polynomial(Q2, y); |
| factor = exp(w) / sqrt(w); |
| value = factor * r; |
| } |
| |
| if (x < 0) |
| { |
| value *= -value; // odd function |
| } |
| return value; |
| } |
| |
| } // namespace detail |
| |
| }} |
| #endif // BOOST_MATH_E_FLOAT_BINDINGS_HPP |
| |