fdim.hpp

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#ifndef STAN_MATH_FWD_FUN_FDIM_HPP
#define STAN_MATH_FWD_FUN_FDIM_HPP
 
#include <stan/math/fwd/meta.hpp>
#include <stan/math/fwd/core.hpp>
#include <stan/math/prim/fun/fdim.hpp>
 
namespace stan {
namespace math {
 
template <typename T>
inline fvar<T> fdim(const fvar<T>& x, const fvar<T>& y) {
  if (x.val_ < y.val_) {
    return fvar<T>(fdim(x.val_, y.val_), 0);
  } else {
    return fvar<T>(fdim(x.val_, y.val_), x.d_ - y.d_);
  }
}
 
template <typename T>
inline fvar<T> fdim(const fvar<T>& x, double y) {
  if (x.val_ < y) {
    return fvar<T>(fdim(x.val_, y), 0);
  } else {
    return fvar<T>(fdim(x.val_, y), x.d_);
  }
}
 
template <typename T>
inline fvar<T> fdim(double x, const fvar<T>& y) {
  if (x < y.val_) {
    return fvar<T>(fdim(x, y.val_), 0);
  } else {
    return fvar<T>(fdim(x, y.val_), -y.d_);
  }
}
 
}  // namespace math
}  // namespace stan
#endif