cos.hpp

Go to the documentation of this file.

#ifndef STAN_MATH_REV_FUN_COS_HPP
#define STAN_MATH_REV_FUN_COS_HPP
 
#include <stan/math/rev/core.hpp>
#include <stan/math/rev/meta.hpp>
#include <stan/math/rev/fun/abs.hpp>
#include <stan/math/rev/fun/cosh.hpp>
#include <stan/math/rev/fun/sinh.hpp>
#include <stan/math/prim/fun/cos.hpp>
#include <cmath>
#include <complex>
 
namespace stan {
namespace math {
 
inline var cos(var a) {
  return make_callback_var(std::cos(a.val()), [a](const auto& vi) mutable {
    a.adj() -= vi.adj() * std::sin(a.val());
  });
}
 
template <typename VarMat, require_var_matrix_t<VarMat>* = nullptr>
inline auto cos(const VarMat& a) {
  return make_callback_var(
      a.val().array().cos().matrix(), [a](const auto& vi) mutable {
        a.adj() -= vi.adj().cwiseProduct(a.val().array().sin().matrix());
      });
}
inline std::complex<var> cos(const std::complex<var>& z) {
  return stan::math::internal::complex_cos(z);
}
 
}  // namespace math
}  // namespace stan
#endif