/usr/include/boost/math/special_functions
Edit: /usr/include/boost/math/special_functions/jacobi_zeta.hpp (2273B)
// Copyright (c) 2015 John Maddock
// 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)
//
#ifndef BOOST_MATH_ELLINT_JZ_HPP
#define BOOST_MATH_ELLINT_JZ_HPP
#ifdef _MSC_VER
#pragma once
#endif
#include
#include
#include
#include
#include
#include
// Elliptic integral the Jacobi Zeta function.
namespace boost { namespace math {
namespace detail{
// Elliptic integral - Jacobi Zeta
template
T jacobi_zeta_imp(T phi, T k, const Policy& pol)
{
BOOST_MATH_STD_USING
using namespace boost::math::tools;
using namespace boost::math::constants;
bool invert = false;
if(phi < 0)
{
phi = fabs(phi);
invert = true;
}
T result;
T sinp = sin(phi);
T cosp = cos(phi);
T s2 = sinp * sinp;
T k2 = k * k;
T kp = 1 - k2;
if(k == 1)
result = sinp * (boost::math::sign)(cosp); // We get here by simplifying JacobiZeta[w, 1] in Mathematica, and the fact that 0 <= phi.
else
result = k2 * sinp * cosp * sqrt(1 - k2 * s2) * ellint_rj_imp(T(0), kp, T(1), T(1 - k2 * s2), pol) / (3 * ellint_k_imp(k, pol));
return invert ? T(-result) : result;
}
} // detail
template
inline typename tools::promote_args::type jacobi_zeta(T1 k, T2 phi, const Policy& pol)
{
typedef typename tools::promote_args::type result_type;
typedef typename policies::evaluation::type value_type;
return policies::checked_narrowing_cast(detail::jacobi_zeta_imp(static_cast(phi), static_cast(k), pol), "boost::math::jacobi_zeta<%1%>(%1%,%1%)");
}
template
inline typename tools::promote_args::type jacobi_zeta(T1 k, T2 phi)
{
return boost::math::jacobi_zeta(k, phi, policies::policy<>());
}
}} // namespaces
#endif // BOOST_MATH_ELLINT_D_HPP