Stan Math Library  2.20.0
reverse mode automatic differentiation
step.hpp
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1 #ifndef STAN_MATH_REV_SCAL_FUN_STEP_HPP
2 #define STAN_MATH_REV_SCAL_FUN_STEP_HPP
3 
4 #include <stan/math/rev/meta.hpp>
5 #include <stan/math/rev/core.hpp>
6 
7 namespace stan {
8 namespace math {
9 
26 inline var step(const var& a) {
27  return var(new vari(a.vi_->val_ < 0.0 ? 0.0 : 1.0));
28 }
29 
30 } // namespace math
31 } // namespace stan
32 #endif
double step(const T &y)
The step, or Heaviside, function.
Definition: step.hpp:29
The variable implementation base class.
Definition: vari.hpp:30
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:33
const double val_
The value of this variable.
Definition: vari.hpp:38
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:45

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