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log1m_exp.hpp
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1 #ifndef STAN_MATH_FWD_SCAL_FUN_LOG1M_EXP_HPP
2 #define STAN_MATH_FWD_SCAL_FUN_LOG1M_EXP_HPP
3
4 #include <stan/math/fwd/core.hpp>
5 #include <stan/math/fwd/scal/fun/expm1.hpp>
6 #include <stan/math/prim/scal/fun/log1m_exp.hpp>
7 #include <stan/math/prim/scal/fun/constants.hpp>
8 #include <cmath>
9
10 namespace stan {
11 namespace math {
12
13 template <typename T>
14 inline
15 fvar<T>
16 log1m_exp(const fvar<T>& x) {
17 using ::expm1;
18 if (x.val_ >= 0)
19 return fvar<T>(NOT_A_NUMBER);
20 return fvar<T>(log1m_exp(x.val_), x.d_ / -expm1(-x.val_));
21 }
22
23 }
24 }
25 #endif
core.hpp
expm1.hpp
stan::math::fvar::d_
T d_
Definition: fvar.hpp:14
stan::math::NOT_A_NUMBER
const double NOT_A_NUMBER
(Quiet) not-a-number value.
Definition: constants.hpp:55
stan
Definition: log_sum_exp.hpp:8
stan::math::expm1
fvar< T > expm1(const fvar< T > &x)
Definition: expm1.hpp:12
stan::math::fvar::val_
T val_
Definition: fvar.hpp:13
stan::math::log1m_exp
fvar< T > log1m_exp(const fvar< T > &x)
Definition: log1m_exp.hpp:16
log1m_exp.hpp
constants.hpp
stan::math::fvar
Definition: fvar.hpp:12

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