sph_bessel_k1

kyosu::sph_bessel_k1 = {}

inlineconstexpr

Computes the spherical Bessel function of the first kind, \( k_1(x)= (\pi/2) e^{-z}(1/z+1/z^2)\) extended to the complex plane and cayley_dickson algebras.

#include <kyosu/functions.hpp>

Callable Signatures

namespace kyosu
{
   template<kyosu::concepts::cayley_dickson T> constexpr auto sph_bessel_k1(T z) noexcept;
   template<eve::floating_ordered_value T>     constexpr T    sph_bessel_k1(T z) noexcept;
}

Parameters

• z: Value to process.

Return value

• returns \(k_1(z)\).

Example

#include <kyosu/kyosu.hpp>
#include <eve/wide.hpp>
#include <iostream>
 
int main()
{
  using kyosu::sph_bessel_k1;
  std::cout.precision(16);
  std::cout << std::scientific << std::endl;
  std::cout << "1.0             " << " -> " << sph_bessel_k1(1.0) << "\n";
  std::cout << "1+0i            " << " -> " << sph_bessel_k1(kyosu::complex(1.0, 0.0)) << "\n";
  std::cout << "15.0            " << " -> " << sph_bessel_k1(15.0) << "\n";
  std::cout << "15+0i           " << " -> " << sph_bessel_k1(kyosu::complex(15.0, 0.0)) << "\n";
  std::cout << "40.0            " << " -> " << sph_bessel_k1(40.0) << "\n";
  std::cout << "40+0i           " << " -> " << sph_bessel_k1(kyosu::complex(40.0, 0.0)) << "\n";
  std::cout << "60.0            " << " -> " << sph_bessel_k1(60.0) << "\n";
  std::cout << "60+0i           " << " -> " << sph_bessel_k1(kyosu::complex(60.0, 0.0)) << "\n";
 
  eve::wide<double, eve::fixed<4>> z(1.0, 15.0, 40.0, 60.0);
  auto zz = kyosu::complex(z);
  std::cout << z  << "\n -> " << sph_bessel_k1(z) << "\n";
  std::cout << zz << "\n -> " << kyosu::real(sph_bessel_k1(zz)) << "\n";
 
  std::cout << "1.0                 " << " -> " << sph_bessel_k1(1.0) << "\n";
  std::cout << "1.0+36.0i           " << " -> " << sph_bessel_k1(kyosu::complex(1.0, 36.0)) << "\n";
  std::cout << "1.0+36.0j           " << " -> " << sph_bessel_k1(kyosu::quaternion(1.0, 0.0, 36.0, 0.0)) << "\n";
  std::cout << "1.0+36.0i+2.0j+1.5k " << " -> " << sph_bessel_k1(kyosu::quaternion(1.0, 36.0, 2.0, 1.5)) << "\n";
 
 
  eve::wide<double, eve::fixed<4>> z1(1.0, 2.0, 40.0, 0.0),  z2(36.0, 0.5, 0.0, 40.0);
  auto z0 = kyosu::complex(z1, z2);
  std::cout << z0 << " \n-> " << sph_bessel_k1(z0) << "\n";
  return 0;
}