Stan Math Library  2.20.0
reverse mode automatic differentiation
cbrt.hpp
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1 #ifndef STAN_MATH_FWD_SCAL_FUN_CBRT_HPP
2 #define STAN_MATH_FWD_SCAL_FUN_CBRT_HPP
3 
4 #include <stan/math/fwd/meta.hpp>
5 #include <stan/math/fwd/core.hpp>
7 
8 namespace stan {
9 namespace math {
10 
18 template <typename T>
19 inline fvar<T> cbrt(const fvar<T>& x) {
20  return fvar<T>(cbrt(x.val_), x.d_ / (3 * square(cbrt(x.val_))));
21 }
22 
23 } // namespace math
24 } // namespace stan
25 #endif
T d_
The tangent (derivative) of this variable.
Definition: fvar.hpp:50
fvar< T > cbrt(const fvar< T > &x)
Return cube root of specified argument.
Definition: cbrt.hpp:19
fvar< T > square(const fvar< T > &x)
Definition: square.hpp:12
T val_
The value of this variable.
Definition: fvar.hpp:45
This template class represents scalars used in forward-mode automatic differentiation, which consist of values and directional derivatives of the specified template type.
Definition: fvar.hpp:41

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