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log1m.hpp
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1 #ifndef STAN_MATH_FWD_SCAL_FUN_LOG1M_HPP
2 #define STAN_MATH_FWD_SCAL_FUN_LOG1M_HPP
3
4 #include <stan/math/fwd/core.hpp>
5
6 #include <stan/math/prim/scal/fun/log1m.hpp>
7 #include <stan/math/prim/scal/fun/constants.hpp>
8
9 namespace stan {
10 namespace math {
11
12 template <typename T>
13 inline
14 fvar<T>
15 log1m(const fvar<T>& x) {
16 if (x.val_ > 1.0)
17 return fvar<T>(NOT_A_NUMBER, NOT_A_NUMBER);
18 else
19 return fvar<T>(log1m(x.val_), -x.d_ / (1 - x.val_));
20 }
21 }
22 }
23 #endif
core.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::fvar::val_
T val_
Definition: fvar.hpp:13
log1m.hpp
constants.hpp
stan::math::log1m
fvar< T > log1m(const fvar< T > &x)
Definition: log1m.hpp:15
stan::math::fvar
Definition: fvar.hpp:12

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