Stan Math Library
2.14.0
reverse mode automatic differentiation
stan
math
fwd
scal
fun
log2.hpp
Go to the documentation of this file.
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#ifndef STAN_MATH_FWD_SCAL_FUN_LOG2_HPP
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#define STAN_MATH_FWD_SCAL_FUN_LOG2_HPP
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#include <
stan/math/fwd/core.hpp
>
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#include <
stan/math/prim/scal/fun/constants.hpp
>
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#include <
stan/math/prim/scal/fun/log2.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
fvar<T>
log2
(
const
fvar<T>
& x) {
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if
(x.
val_
< 0.0)
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return
fvar<T>
(
NOT_A_NUMBER
,
NOT_A_NUMBER
);
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else
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return
fvar<T>
(
log2
(x.
val_
), x.
d_
/ (x.
val_
*
LOG_2
));
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}
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}
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}
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#endif
stan::math::LOG_2
const double LOG_2
The natural logarithm of 2, .
Definition:
constants.hpp:32
core.hpp
stan::math::fvar::d_
T d_
Definition:
fvar.hpp:16
stan::math::NOT_A_NUMBER
const double NOT_A_NUMBER
(Quiet) not-a-number value.
Definition:
constants.hpp:55
stan
Definition:
log_sum_exp.hpp:8
stan::math::fvar::val_
T val_
Definition:
fvar.hpp:15
constants.hpp
log2.hpp
stan::math::log2
fvar< T > log2(const fvar< T > &x)
Return the base two logarithm of the specified argument.
Definition:
log2.hpp:19
stan::math::fvar
Definition:
fvar.hpp:14
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