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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
6 #include <stan/math/prim/scal/fun/multiply_log.hpp>
7
8 namespace stan {
9 namespace math {
10
11 template <typename T>
12 inline
13 fvar<T>
14 multiply_log(const fvar<T>& x1, const fvar<T>& x2) {
15 using std::log;
16 return fvar<T>(multiply_log(x1.val_, x2.val_),
17 x1.d_ * log(x2.val_) + x1.val_ * x2.d_ / x2.val_);
18 }
19
20 template <typename T>
21 inline
22 fvar<T>
23 multiply_log(const double x1, const fvar<T>& x2) {
24 using std::log;
25 return fvar<T>(multiply_log(x1, x2.val_),
26 x1 * x2.d_ / x2.val_);
27 }
28
29 template <typename T>
30 inline
31 fvar<T>
32 multiply_log(const fvar<T>& x1, const double x2) {
33 using std::log;
34 return fvar<T>(multiply_log(x1.val_, x2),
35 x1.d_ * log(x2));
36 }
37 }
38 }
39 #endif
core.hpp
stan::math::fvar::d_
T d_
Definition: fvar.hpp:14
stan
Definition: log_sum_exp.hpp:8
stan::math::log
fvar< T > log(const fvar< T > &x)
Definition: log.hpp:14
multiply_log.hpp
stan::math::fvar::val_
T val_
Definition: fvar.hpp:13
stan::math::multiply_log
fvar< T > multiply_log(const fvar< T > &x1, const fvar< T > &x2)
Definition: multiply_log.hpp:14
stan::math::fvar
Definition: fvar.hpp:12

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