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erf.hpp
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1 #ifndef STAN_MATH_REV_SCAL_FUN_ERF_HPP
2 #define STAN_MATH_REV_SCAL_FUN_ERF_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 erf_vari : public op_v_vari {
15 public:
16 explicit erf_vari(vari* avi) :
17 op_v_vari(::erf(avi->val_), avi) {
18 }
19 void chain() {
20 avi_->adj_ += adj_ * stan::math::TWO_OVER_SQRT_PI
21 * std::exp(- avi_->val_ * avi_->val_);
22 }
23 };
24 }
25
63 inline var erf(const var& a) {
64 return var(new erf_vari(a.vi_));
65 }
66
67 }
68 }
69 #endif
core.hpp
stan::math::erf
fvar< T > erf(const fvar< T > &x)
Definition: erf.hpp:14
stan::math::var
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:32
stan::math::TWO_OVER_SQRT_PI
const double TWO_OVER_SQRT_PI
Definition: constants.hpp:161
stan::math::exp
fvar< T > exp(const fvar< T > &x)
Definition: exp.hpp:10
stan::math::var::vi_
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:44
constants.hpp

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