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reverse mode automatic differentiation
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scal
fun
log_falling_factorial.hpp
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#ifndef STAN_MATH_PRIM_SCAL_FUN_LOG_FALLING_FACTORIAL_HPP
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#define STAN_MATH_PRIM_SCAL_FUN_LOG_FALLING_FACTORIAL_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
T1,
typename
T2>
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inline
typename
boost::math::tools::promote_args<T1, T2>::type
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log_falling_factorial
(
const
T1 x,
const
T2 n) {
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return
lgamma
(x + 1) -
lgamma
(x - n + 1);
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}
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}
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}
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#endif
lgamma.hpp
stan::math::log_falling_factorial
fvar< T > log_falling_factorial(const fvar< T > &x, const fvar< T > &n)
Definition:
log_falling_factorial.hpp:15
stan::math::lgamma
fvar< T > lgamma(const fvar< T > &x)
Definition:
lgamma.hpp:15
stan
Definition:
log_sum_exp.hpp:8
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