Stan Math Library
2.14.0
reverse mode automatic differentiation
stan
math
fwd
scal
fun
lgamma.hpp
Go to the documentation of this file.
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#ifndef STAN_MATH_FWD_SCAL_FUN_LGAMMA_HPP
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#define STAN_MATH_FWD_SCAL_FUN_LGAMMA_HPP
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#include <
stan/math/fwd/core.hpp
>
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#include <
stan/math/prim/scal/fun/digamma.hpp
>
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#include <
stan/math/prim/scal/fun/lgamma.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>
lgamma
(
const
fvar<T>
& x) {
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return
fvar<T>
(
lgamma
(x.
val_
),
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x.
d_
*
digamma
(x.
val_
));
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}
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}
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}
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#endif
lgamma.hpp
core.hpp
stan::math::fvar::d_
T d_
Definition:
fvar.hpp:16
stan::math::lgamma
fvar< T > lgamma(const fvar< T > &x)
Return the natural logarithm of the gamma function applied to the specified argument.
Definition:
lgamma.hpp:20
stan
Definition:
log_sum_exp.hpp:8
digamma.hpp
stan::math::fvar::val_
T val_
Definition:
fvar.hpp:15
stan::math::fvar
Definition:
fvar.hpp:14
stan::math::digamma
fvar< T > digamma(const fvar< T > &x)
Return the derivative of the log gamma function at the specified argument.
Definition:
digamma.hpp:22
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