bessel_second_kind.hpp

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#ifndef STAN_MATH_PRIM_FUN_BESSEL_SECOND_KIND_HPP
#define STAN_MATH_PRIM_FUN_BESSEL_SECOND_KIND_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/functor/apply_scalar_binary.hpp>
#include <boost/math/special_functions/bessel.hpp>
 
namespace stan {
namespace math {
 
template <typename T2, require_arithmetic_t<T2>* = nullptr>
inline T2 bessel_second_kind(int v, const T2 z) {
  return boost::math::cyl_neumann(v, z);
}
 
template <typename T1, typename T2, require_any_container_t<T1, T2>* = nullptr,
          require_not_var_matrix_t<T2>* = nullptr>
inline auto bessel_second_kind(T1&& a, T2&& b) {
  return apply_scalar_binary(
      [](auto&& c, auto&& d) {
        return bessel_second_kind(std::forward<decltype(c)>(c),
                                  std::forward<decltype(d)>(d));
      },
      std::forward<T1>(a), std::forward<T2>(b));
}
 
}  // namespace math
}  // namespace stan
 
#endif