asinh.hpp

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#ifndef STAN_MATH_PRIM_FUN_ASINH_HPP
#define STAN_MATH_PRIM_FUN_ASINH_HPP
 
#include <stan/math/prim/core.hpp>
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/fun/abs.hpp>
#include <stan/math/prim/fun/arg.hpp>
#include <stan/math/prim/fun/copysign.hpp>
#include <stan/math/prim/fun/isfinite.hpp>
#include <stan/math/prim/fun/isinf.hpp>
#include <stan/math/prim/fun/isnan.hpp>
#include <stan/math/prim/fun/log.hpp>
#include <stan/math/prim/fun/polar.hpp>
#include <stan/math/prim/fun/sqrt.hpp>
#include <stan/math/prim/fun/value_of_rec.hpp>
#include <stan/math/prim/functor/apply_scalar_unary.hpp>
#include <cmath>
#include <complex>
 
namespace stan {
namespace math {
 
struct asinh_fun {
  template <typename T>
  static inline auto fun(const T& x) {
    using std::asinh;
    return asinh(x);
  }
};
 
template <
    typename T, require_not_var_matrix_t<T>* = nullptr,
    require_all_not_nonscalar_prim_or_rev_kernel_expression_t<T>* = nullptr>
inline auto asinh(const T& x) {
  return apply_scalar_unary<asinh_fun, T>::apply(x);
}
 
namespace internal {
template <typename V>
inline std::complex<V> complex_asinh(const std::complex<V>& z) {
  std::complex<double> y_d = asinh(value_of_rec(z));
  auto y = log(z + sqrt(1 + z * z));
  return copysign(y, y_d);
}
}  // namespace internal
}  // namespace math
}  // namespace stan
 
#endif