Stan Math Library
2.8.0
reverse mode automatic differentiation
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stan
math
fwd
scal
fun
log.hpp
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#ifndef STAN_MATH_FWD_SCAL_FUN_LOG_HPP
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#define STAN_MATH_FWD_SCAL_FUN_LOG_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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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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log
(
const
fvar<T>
& x) {
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using
std::log
;
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using
stan::math::NOT_A_NUMBER
;
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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>
(
log
(x.
val_
), x.
d_
/ 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::NOT_A_NUMBER
const double NOT_A_NUMBER
(Quiet) not-a-number value.
Definition:
constants.hpp:56
stan::math::log
fvar< T > log(const fvar< T > &x)
Definition:
log.hpp:15
stan::math::fvar::val_
T val_
Definition:
fvar.hpp:14
stan::math::log
var log(const var &a)
Return the natural log of the specified variable (cmath).
Definition:
log.hpp:50
constants.hpp
stan::math::fvar
Definition:
fvar.hpp:13
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