Stan Math Library  2.12.0
reverse mode automatic differentiation
fdim.hpp
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1 #ifndef STAN_MATH_FWD_SCAL_FUN_FDIM_HPP
2 #define STAN_MATH_FWD_SCAL_FUN_FDIM_HPP
3 
4 #include <stan/math/fwd/core.hpp>
6 
7 namespace stan {
8  namespace math {
9 
10  template <typename T>
11  inline fvar<T> fdim(const fvar<T>& x1, const fvar<T>& x2) {
12  using std::floor;
13  if (x1.val_ < x2.val_)
14  return fvar<T>(fdim(x1.val_, x2.val_), 0);
15  else
16  return fvar<T>(fdim(x1.val_, x2.val_),
17  x1.d_ - x2.d_ * floor(x1.val_ / x2.val_));
18  }
19 
20  template <typename T>
21  inline fvar<T> fdim(const fvar<T>& x1, const double x2) {
22  using std::floor;
23  if (x1.val_ < x2)
24  return fvar<T>(fdim(x1.val_, x2), 0);
25  else
26  return fvar<T>(fdim(x1.val_, x2), x1.d_);
27  }
28 
29  template <typename T>
30  inline fvar<T> fdim(const double x1, const fvar<T>& x2) {
31  using std::floor;
32  if (x1 < x2.val_)
33  return fvar<T>(fdim(x1, x2.val_), 0);
34  else
35  return fvar<T>(fdim(x1, x2.val_), x2.d_ * -floor(x1 / x2.val_));
36  }
37 
38  }
39 }
40 #endif
fvar< T > fdim(const fvar< T > &x1, const fvar< T > &x2)
Definition: fdim.hpp:11
fvar< T > floor(const fvar< T > &x)
Definition: floor.hpp:11

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