exp.hpp

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#ifndef STAN_MATH_REV_FUN_EXP_HPP
#define STAN_MATH_REV_FUN_EXP_HPP
 
#include <stan/math/rev/meta.hpp>
#include <stan/math/rev/core.hpp>
#include <stan/math/rev/fun/cos.hpp>
#include <stan/math/rev/fun/is_inf.hpp>
#include <stan/math/rev/fun/is_nan.hpp>
#include <stan/math/rev/fun/sin.hpp>
#include <stan/math/prim/fun/exp.hpp>
#include <cmath>
#include <complex>
 
namespace stan {
namespace math {
 
inline var exp(const var& a) {
  return make_callback_var(std::exp(a.val()), [a](auto& vi) mutable {
    a.adj() += vi.adj() * vi.val();
  });
}
 
inline std::complex<var> exp(const std::complex<var>& z) {
  return internal::complex_exp(z);
}
 
template <typename T, require_var_matrix_t<T>* = nullptr>
inline auto exp(const T& x) {
  return make_callback_var(
      x.val().array().exp().matrix(), [x](const auto& vi) mutable {
        x.adj() += (vi.val().array() * vi.adj().array()).matrix();
      });
}
 
}  // namespace math
}  // namespace stan
#endif