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asinh.hpp
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1 #ifndef STAN_MATH_REV_SCAL_FUN_ASINH_HPP
2 #define STAN_MATH_REV_SCAL_FUN_ASINH_HPP
3
4 #include <math.h>
5 #include <stan/math/rev/core.hpp>
6 #include <boost/math/special_functions/fpclassify.hpp>
7 #include <cmath>
8 #include <valarray>
9
10 namespace stan {
11 namespace math {
12
13 namespace {
14 class asinh_vari : public op_v_vari {
15 public:
16 asinh_vari(double val, vari* avi) :
17 op_v_vari(val, avi) {
18 }
19 void chain() {
20 avi_->adj_ += adj_ / std::sqrt(avi_->val_ * avi_->val_ + 1.0);
21 }
22 };
23 }
24
62 inline var asinh(const var& a) {
63 if (boost::math::isinf(a.val()))
64 return var(new asinh_vari(a.val(), a.vi_));
65 return var(new asinh_vari(::asinh(a.val()), a.vi_));
66 }
67
68 }
69 }
70 #endif
core.hpp
stan::math::sqrt
fvar< T > sqrt(const fvar< T > &x)
Definition: sqrt.hpp:15
stan::math::var
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:32
boost::math::isinf
bool isinf(const stan::math::var &v)
Checks if the given number is infinite.
Definition: boost_isinf.hpp:22
stan::math::asinh
fvar< T > asinh(const fvar< T > &x)
Definition: asinh.hpp:13
stan::math::var::vi_
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:44
stan::math::var::val
double val() const
Return the value of this variable.
Definition: var.hpp:234

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