gamma_p.hpp

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#ifndef STAN_MATH_PRIM_FUN_GAMMA_P_HPP
#define STAN_MATH_PRIM_FUN_GAMMA_P_HPP
 
#include <stan/math/prim/err.hpp>
#include <stan/math/prim/fun/boost_policy.hpp>
#include <stan/math/prim/fun/constants.hpp>
#include <stan/math/prim/fun/is_nan.hpp>
#include <stan/math/prim/functor/apply_scalar_binary.hpp>
#include <boost/math/special_functions/gamma.hpp>
 
namespace stan {
namespace math {
 
inline double gamma_p(double z, double a) {
  if (is_nan(z)) {
    return not_a_number();
  }
  if (is_nan(a)) {
    return not_a_number();
  }
  check_positive("gamma_p", "first argument (z)", z);
  check_nonnegative("gamma_p", "second argument (a)", a);
  return boost::math::gamma_p(z, a, boost_policy_t<>());
}
 
template <typename T1, typename T2, require_any_container_t<T1, T2>* = nullptr>
inline auto gamma_p(const T1& a, const T2& b) {
  return apply_scalar_binary(
      a, b, [&](const auto& c, const auto& d) { return gamma_p(c, d); });
}
 
}  // namespace math
}  // namespace stan
#endif