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logit.hpp
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1 #ifndef STAN_MATH_FWD_SCAL_FUN_LOGIT_HPP
2 #define STAN_MATH_FWD_SCAL_FUN_LOGIT_HPP
3
4 #include <stan/math/fwd/core.hpp>
5
6 #include <stan/math/prim/scal/fun/logit.hpp>
7 #include <stan/math/prim/scal/fun/square.hpp>
8 #include <stan/math/prim/scal/fun/constants.hpp>
9
10 namespace stan {
11 namespace math {
12
13 template <typename T>
14 inline
15 fvar<T>
16 logit(const fvar<T>& x) {
17 if (x.val_ > 1 || x.val_ < 0)
18 return fvar<T>(NOT_A_NUMBER, NOT_A_NUMBER);
19 else
20 return fvar<T>(logit(x.val_), x.d_ / (x.val_ - square(x.val_)));
21 }
22 }
23 }
24 #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
square.hpp
stan::math::square
fvar< T > square(const fvar< T > &x)
Definition: square.hpp:14
stan::math::fvar::val_
T val_
Definition: fvar.hpp:13
stan::math::logit
fvar< T > logit(const fvar< T > &x)
Definition: logit.hpp:16
constants.hpp
logit.hpp
stan::math::fvar
Definition: fvar.hpp:12

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