Stan Math Library  2.11.0
reverse mode automatic differentiation
log2.hpp
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1 #ifndef STAN_MATH_FWD_SCAL_FUN_LOG2_HPP
2 #define STAN_MATH_FWD_SCAL_FUN_LOG2_HPP
3 
4 #include <stan/math/fwd/core.hpp>
5 
8 
9 
10 namespace stan {
11 
12  namespace math {
13 
14  template <typename T>
15  inline
16  fvar<T>
17  log2(const fvar<T>& x) {
18  using std::log;
19  using stan::math::log2;
21  if (x.val_ < 0.0)
23  else
24  return fvar<T>(log2(x.val_), x.d_ / (x.val_ * stan::math::LOG_2));
25  }
26  }
27 }
28 #endif
const double LOG_2
The natural logarithm of 2, .
Definition: constants.hpp:33
const double NOT_A_NUMBER
(Quiet) not-a-number value.
Definition: constants.hpp:56
fvar< T > log(const fvar< T > &x)
Definition: log.hpp:15
fvar< T > log2(const fvar< T > &x)
Definition: log2.hpp:17

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