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reverse mode automatic differentiation
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stan
math
prim
scal
fun
log1p_exp.hpp
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#ifndef STAN_MATH_PRIM_SCAL_FUN_LOG1P_EXP_HPP
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#define STAN_MATH_PRIM_SCAL_FUN_LOG1P_EXP_HPP
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#include <boost/math/tools/promotion.hpp>
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#include <
stan/math/prim/scal/fun/log1p.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
typename
boost::math::tools::promote_args<T>::type
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log1p_exp
(
const
T a) {
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using
std::exp
;
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// like log_sum_exp below with b=0.0; prevents underflow
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if
(a > 0.0)
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return
a +
log1p
(
exp
(-a));
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return
log1p
(
exp
(a));
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}
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}
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}
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#endif
stan
Definition:
log_sum_exp.hpp:8
stan::math::exp
fvar< T > exp(const fvar< T > &x)
Definition:
exp.hpp:10
stan::math::log1p_exp
fvar< T > log1p_exp(const fvar< T > &x)
Definition:
log1p_exp.hpp:13
stan::math::log1p
fvar< T > log1p(const fvar< T > &x)
Definition:
log1p.hpp:16
log1p.hpp
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