Stan Math Library  2.20.0
reverse mode automatic differentiation
precomp_v_vari.hpp
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1 #ifndef STAN_MATH_REV_CORE_PRECOMP_V_VARI_HPP
2 #define STAN_MATH_REV_CORE_PRECOMP_V_VARI_HPP
3 
6 
7 namespace stan {
8 namespace math {
9 
10 // use for single precomputed partials
11 class precomp_v_vari : public op_v_vari {
12  protected:
13  double da_;
14 
15  public:
16  precomp_v_vari(double val, vari* avi, double da)
17  : op_v_vari(val, avi), da_(da) {}
18  void chain() { avi_->adj_ += adj_ * da_; }
19 };
20 
21 } // namespace math
22 } // namespace stan
23 #endif
The variable implementation base class.
Definition: vari.hpp:30
double adj_
The adjoint of this variable, which is the partial derivative of this variable with respect to the ro...
Definition: vari.hpp:44
void chain()
Apply the chain rule to this variable based on the variables on which it depends. ...
precomp_v_vari(double val, vari *avi, double da)

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