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expm1.hpp
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1 #ifndef STAN_MATH_REV_SCAL_FUN_EXPM1_HPP
2 #define STAN_MATH_REV_SCAL_FUN_EXPM1_HPP
3 
4 #include <math.h>
5 #include <stan/math/rev/core.hpp>
7 #include <cmath>
8 #include <valarray>
9 
10 namespace stan {
11  namespace math {
12 
13  namespace {
14  class expm1_vari : public op_v_vari {
15  public:
16  explicit expm1_vari(vari* avi) :
17  op_v_vari(::expm1(avi->val_), avi) {
18  }
19  void chain() {
20  avi_->adj_ += adj_ * (val_ + 1.0);
21  }
22  };
23  }
24 
52  inline var expm1(const stan::math::var& a) {
53  return var(new expm1_vari(a.vi_));
54  }
55 
56  }
57 }
58 #endif
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:32
fvar< T > expm1(const fvar< T > &x)
Definition: expm1.hpp:12
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:44

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