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2.12.0
reverse mode automatic differentiation
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stan
math
fwd
scal
fun
inv_square.hpp
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#ifndef STAN_MATH_FWD_SCAL_FUN_INV_SQUARE_HPP
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#define STAN_MATH_FWD_SCAL_FUN_INV_SQUARE_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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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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inv_square
(
const
fvar<T>
& x) {
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T square_x(
square
(x.
val_
));
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return
fvar<T>
(1 / square_x, -2 * x.
d_
/ (square_x * 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:14
stan
Definition:
log_sum_exp.hpp:8
square.hpp
stan::math::square
fvar< T > square(const fvar< T > &x)
Definition:
square.hpp:14
stan::math::fvar::val_
T val_
Definition:
fvar.hpp:13
stan::math::inv_square
fvar< T > inv_square(const fvar< T > &x)
Definition:
inv_square.hpp:14
stan::math::fvar
Definition:
fvar.hpp:12
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