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reverse mode automatic differentiation
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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 <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
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fvar<T>
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tgamma
(
const
fvar<T>
& x) {
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using
boost::math::digamma
;
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using
boost::math::tgamma
;
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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:14
stan
Definition:
log_sum_exp.hpp:8
stan::math::fvar::val_
T val_
Definition:
fvar.hpp:13
stan::math::tgamma
var tgamma(const var &a)
Return the Gamma function applied to the specified variable (C99).
Definition:
tgamma.hpp:65
stan::math::tgamma
fvar< T > tgamma(const fvar< T > &x)
Definition:
tgamma.hpp:14
stan::math::fvar
Definition:
fvar.hpp:12
stan::math::digamma
fvar< T > digamma(const fvar< T > &x)
Definition:
digamma.hpp:15
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