logit.hpp

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#ifndef STAN_MATH_FWD_FUN_LOGIT_HPP
#define STAN_MATH_FWD_FUN_LOGIT_HPP
 
#include <stan/math/fwd/meta.hpp>
#include <stan/math/fwd/core.hpp>
#include <stan/math/prim/fun/logit.hpp>
#include <stan/math/prim/fun/square.hpp>
#include <stan/math/prim/fun/constants.hpp>
 
namespace stan {
namespace math {
 
template <typename T>
inline fvar<T> logit(const fvar<T>& x) {
  if (x.val_ > 1 || x.val_ < 0) {
    return fvar<T>(NOT_A_NUMBER, NOT_A_NUMBER);
  } else {
    return fvar<T>(logit(x.val_), x.d_ / (x.val_ - square(x.val_)));
  }
}
}  // namespace math
}  // namespace stan
#endif