Stan Math Library
2.14.0
reverse mode automatic differentiation
stan
math
fwd
scal
fun
atan.hpp
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#ifndef STAN_MATH_FWD_SCAL_FUN_ATAN_HPP
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#define STAN_MATH_FWD_SCAL_FUN_ATAN_HPP
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#include <
stan/math/fwd/core.hpp
>
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#include <
stan/math/prim/scal/fun/square.hpp
>
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#include <cmath>
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namespace
stan
{
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namespace
math {
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template
<
typename
T>
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inline
fvar<T>
atan
(
const
fvar<T>
& x) {
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using
std::atan
;
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return
fvar<T>
(
atan
(x.
val_
), x.
d_
/ (1 +
square
(x.
val_
)));
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}
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}
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}
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#endif
core.hpp
stan::math::fvar::d_
T d_
Definition:
fvar.hpp:16
stan
Definition:
log_sum_exp.hpp:8
square.hpp
stan::math::atan
fvar< T > atan(const fvar< T > &x)
Definition:
atan.hpp:12
stan::math::square
fvar< T > square(const fvar< T > &x)
Definition:
square.hpp:14
stan::math::fvar::val_
T val_
Definition:
fvar.hpp:15
stan::math::atan
var atan(const var &a)
Return the principal value of the arc tangent, in radians, of the specified variable (cmath)...
Definition:
atan.hpp:55
stan::math::fvar
Definition:
fvar.hpp:14
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