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multiply_log.hpp
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1 #ifndef STAN_MATH_FWD_SCAL_FUN_MULTIPLY_LOG_HPP
2 #define STAN_MATH_FWD_SCAL_FUN_MULTIPLY_LOG_HPP
3 
4 #include <stan/math/fwd/core.hpp>
5 
7 
8 namespace stan {
9 
10  namespace math {
11 
12  template <typename T>
13  inline
14  fvar<T>
15  multiply_log(const fvar<T>& x1, const fvar<T>& x2) {
17  using std::log;
18  return fvar<T>(multiply_log(x1.val_, x2.val_),
19  x1.d_ * log(x2.val_) + x1.val_ * x2.d_ / x2.val_);
20  }
21 
22  template <typename T>
23  inline
24  fvar<T>
25  multiply_log(const double x1, const fvar<T>& x2) {
27  using std::log;
28  return fvar<T>(multiply_log(x1, x2.val_),
29  x1 * x2.d_ / x2.val_);
30  }
31 
32  template <typename T>
33  inline
34  fvar<T>
35  multiply_log(const fvar<T>& x1, const double x2) {
37  using std::log;
38  return fvar<T>(multiply_log(x1.val_, x2),
39  x1.d_ * log(x2));
40  }
41  }
42 }
43 #endif
fvar< T > log(const fvar< T > &x)
Definition: log.hpp:15
fvar< T > multiply_log(const fvar< T > &x1, const fvar< T > &x2)

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