Stan Math Library  2.10.0
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 <math.h>
5 #include <stan/math/fwd/core.hpp>
7 
8 namespace stan {
9  namespace math {
10 
11  template <typename T>
12  inline
13  fvar<T>
14  cbrt(const fvar<T>& x) {
16  using stan::math::square;
17  return fvar<T>(cbrt(x.val_),
18  x.d_ / (square(cbrt(x.val_)) * 3.0));
19  }
20 
21  }
22 }
23 #endif
fvar< T > cbrt(const fvar< T > &x)
Definition: cbrt.hpp:14
fvar< T > square(const fvar< T > &x)
Definition: square.hpp:15
var cbrt(const var &a)
Returns the cube root of the specified variable (C99).
Definition: cbrt.hpp:56

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