Automatic Differentiation
 
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cos.hpp
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1#ifndef STAN_MATH_PRIM_FUN_COS_HPP
2#define STAN_MATH_PRIM_FUN_COS_HPP
3
10#include <cmath>
11#include <complex>
12
13namespace stan {
14namespace math {
15
23template <typename T, require_arithmetic_t<T>* = nullptr>
24inline auto cos(const T x) {
25 return std::cos(x);
26}
27
35template <typename T, require_complex_bt<std::is_arithmetic, T>* = nullptr>
36inline auto cos(const T x) {
37 return std::cos(x);
38}
39
47struct cos_fun {
48 template <typename T>
49 static inline auto fun(T&& x) {
50 return cos(std::forward<T>(x));
51 }
52};
53
62template <typename Container, require_ad_container_t<Container>* = nullptr>
63inline auto cos(Container&& x) {
65 std::forward<Container>(x));
66}
67
76template <typename Container,
78inline auto cos(Container&& x) {
79 return apply_vector_unary<Container>::apply(
80 std::forward<Container>(x), [](auto&& v) { return v.array().cos(); });
81}
82
83namespace internal {
91template <typename T>
92inline std::complex<T> complex_cos(const std::complex<T>& z) {
93 return cosh(i_times(z));
94}
95} // namespace internal
96
97} // namespace math
98} // namespace stan
99
100#endif
require_t< container_type_check_base< is_container, base_type_t, TypeCheck, Check... > > require_container_bt
Require type satisfies is_container.
std::complex< T > complex_cos(const std::complex< T > &z)
Return the cosine of the complex argument.
Definition cos.hpp:92
std::complex< T > i_times(const std::complex< T > &z)
Return the specified complex number multiplied by i.
Definition i_times.hpp:20
fvar< T > cosh(const fvar< T > &x)
Definition cosh.hpp:16
fvar< T > cos(const fvar< T > &x)
Definition cos.hpp:16
The lgamma implementation in stan-math is based on either the reentrant safe lgamma_r implementation ...
Base template class for vectorization of unary scalar functions defined by a template class F to a sc...
static auto fun(T &&x)
Definition cos.hpp:49
Structure to wrap cos() so it can be vectorized.
Definition cos.hpp:47