Stan Math Library
2.9.0
reverse mode automatic differentiation
Main Page
Modules
Namespaces
Classes
Files
File List
File Members
stan
math
fwd
scal
fun
abs.hpp
Go to the documentation of this file.
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
[
Stan Home Page
]
© 2011–2015, Stan Development Team.