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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>
6 #include <stan/math/prim/scal/fun/constants.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
core.hpp
stan::math::var
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:32
stan::math::expm1
fvar< T > expm1(const fvar< T > &x)
Definition: expm1.hpp:12
stan::math::var::vi_
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:44
constants.hpp

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