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2.11.0
reverse mode automatic differentiation
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stan
math
fwd
scal
fun
acos.hpp
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#ifndef STAN_MATH_FWD_SCAL_FUN_ACOS_HPP
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#define STAN_MATH_FWD_SCAL_FUN_ACOS_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
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fvar<T>
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acos
(
const
fvar<T>
& x) {
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using
std::acos
;
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using
std::sqrt
;
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using
stan::math::square
;
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return
fvar<T>
(
acos
(x.
val_
), x.
d_
/ -
sqrt
(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:15
stan::math::sqrt
fvar< T > sqrt(const fvar< T > &x)
Definition:
sqrt.hpp:15
stan
Definition:
log_sum_exp.hpp:8
square.hpp
stan::math::square
fvar< T > square(const fvar< T > &x)
Definition:
square.hpp:15
stan::math::acos
var acos(const var &a)
Return the principal value of the arc cosine of a variable, in radians (cmath).
Definition:
acos.hpp:59
stan::math::fvar::val_
T val_
Definition:
fvar.hpp:14
stan::math::acos
fvar< T > acos(const fvar< T > &x)
Definition:
acos.hpp:14
stan::math::fvar
Definition:
fvar.hpp:13
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