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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
12 namespace math {
13
14 template <typename T>
15 inline
16 fvar<T>
17 logit(const fvar<T>& x) {
18 using stan::math::logit;
19 using stan::math::square;
20 using stan::math::NOT_A_NUMBER;
21 if (x.val_ > 1 || x.val_ < 0)
22 return fvar<T>(NOT_A_NUMBER, NOT_A_NUMBER);
23 else
24 return fvar<T>(logit(x.val_), x.d_ / (x.val_ - square(x.val_)));
25 }
26 }
27 }
28 #endif
core.hpp
stan::math::fvar::d_
T d_
Definition: fvar.hpp:15
stan::math::NOT_A_NUMBER
const double NOT_A_NUMBER
(Quiet) not-a-number value.
Definition: constants.hpp:56
stan
Definition: log_sum_exp.hpp:8
square.hpp
stan::math::square
fvar< T > square(const fvar< T > &x)
Definition: square.hpp:15
stan::math::fvar::val_
T val_
Definition: fvar.hpp:14
stan::math::logit
fvar< T > logit(const fvar< T > &x)
Definition: logit.hpp:17
constants.hpp
logit.hpp
stan::math::fvar
Definition: fvar.hpp:13

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