1 #ifndef STAN_MATH_PRIM_MAT_FUN_ATAN_HPP
2 #define STAN_MATH_PRIM_MAT_FUN_ATAN_HPP
18 static inline T
fun(
const T& x) {
31 inline typename apply_scalar_unary<atan_fun, T>::return_t
fvar< T > atan(const fvar< T > &x)
var atan(const var &a)
Return the principal value of the arc tangent, in radians, of the specified variable (cmath)...
static return_t apply(const T &x)
Return the result of applying the function defined by the template parameter F to the specified matri...
Structure to wrap atan() so it can be vectorized.