Stan Math Library
2.15.0
reverse mode automatic differentiation
stan
math
fwd
scal
fun
tgamma.hpp
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#ifndef STAN_MATH_FWD_SCAL_FUN_TGAMMA_HPP
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#define STAN_MATH_FWD_SCAL_FUN_TGAMMA_HPP
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#include <
stan/math/fwd/core.hpp
>
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#include <
stan/math/prim/scal/fun/tgamma.hpp
>
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#include <boost/math/special_functions/digamma.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>
tgamma
(
const
fvar<T>
& x) {
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using
boost::math::digamma
;
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T u =
tgamma
(x.
val_
);
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return
fvar<T>
(u, x.
d_
* u *
digamma
(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:16
stan
Definition:
log_sum_exp.hpp:8
stan::math::fvar::val_
T val_
Definition:
fvar.hpp:15
tgamma.hpp
stan::math::tgamma
fvar< T > tgamma(const fvar< T > &x)
Return the result of applying the gamma function to the specified argument.
Definition:
tgamma.hpp:20
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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