tanh.hpp

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#ifndef STAN_MATH_REV_FUN_TANH_HPP
#define STAN_MATH_REV_FUN_TANH_HPP
 
#include <stan/math/rev/meta.hpp>
#include <stan/math/rev/core.hpp>
#include <stan/math/rev/fun/cosh.hpp>
#include <stan/math/rev/fun/exp.hpp>
#include <stan/math/prim/fun/tanh.hpp>
#include <cmath>
#include <complex>
 
namespace stan {
namespace math {
 
inline var tanh(const var& a) {
  return make_callback_var(std::tanh(a.val()), [a](const auto& vi) mutable {
    const auto a_cosh = std::cosh(a.val());
    a.adj() += vi.adj_ / (a_cosh * a_cosh);
  });
}
 
template <typename VarMat, require_var_matrix_t<VarMat>* = nullptr>
inline auto tanh(const VarMat& a) {
  return make_callback_var(
      a.val().array().tanh().matrix(), [a](const auto& vi) mutable {
        a.adj().array() += vi.adj_.array() / (a.val().array().cosh().square());
      });
}
 
inline std::complex<var> tanh(const std::complex<var>& z) {
  return stan::math::internal::complex_tanh(z);
}
 
}  // namespace math
}  // namespace stan
#endif