Stan Math Library  2.11.0
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/core.hpp>
5 
6 namespace stan {
7  namespace math {
8 
25  inline var step(const stan::math::var& a) {
26  return var(new vari(a.vi_->val_ < 0.0 ? 0.0 : 1.0));
27  }
28 
29  }
30 }
31 #endif
The variable implementation base class.
Definition: vari.hpp:30
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:31
const double val_
The value of this variable.
Definition: vari.hpp:38
int step(const T y)
The step, or Heaviside, function.
Definition: step.hpp:29
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:43

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