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abs.hpp
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1 #ifndef STAN_MATH_FWD_SCAL_FUN_ABS_HPP
2 #define STAN_MATH_FWD_SCAL_FUN_ABS_HPP
3
4 #include <stan/math/fwd/scal/fun/value_of.hpp>
5 #include <stan/math/fwd/core.hpp>
6 #include <stan/math/prim/scal/fun/constants.hpp>
7 #include <stan/math/prim/scal/fun/abs.hpp>
8 #include <stan/math/prim/scal/fun/value_of.hpp>
9 #include <stan/math/prim/scal/meta/likely.hpp>
10
11 namespace stan {
12 namespace math {
13
14 template<typename T>
15 inline fvar<T> abs(const fvar<T>& x) {
16 using stan::math::abs;
17 using stan::math::value_of;
18 if (x.val_ > 0.0)
19 return x;
20 else if (x.val_ < 0.0)
21 return fvar<T>(-x.val_, -x.d_);
22 else if (x.val_ == 0.0)
23 return fvar<T>(0, 0);
24 else
25 return fvar<T>(abs(x.val_), stan::math::NOT_A_NUMBER);
26 }
27
28 }
29 }
30 #endif
stan::math::abs
fvar< T > abs(const fvar< T > &x)
Definition: abs.hpp:15
core.hpp
stan::math::fvar::d_
T d_
Definition: fvar.hpp:15
stan::math::NOT_A_NUMBER
const double NOT_A_NUMBER
(Quiet) not-a-number value.
Definition: constants.hpp:56
stan
Definition: log_sum_exp.hpp:8
stan::math::value_of
T value_of(const fvar< T > &v)
Return the value of the specified variable.
Definition: value_of.hpp:16
value_of.hpp
abs.hpp
stan::math::fvar::val_
T val_
Definition: fvar.hpp:14
likely.hpp
constants.hpp
value_of.hpp
stan::math::fvar
Definition: fvar.hpp:13

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