math/fwd_2fun_2_phi__approx_8hpp_source.html

#ifndef STAN_MATH_FWD_FUN_PHI_APPROX_HPP

#define STAN_MATH_FWD_FUN_PHI_APPROX_HPP


#include <stan/math/fwd/meta.hpp>

#include <stan/math/fwd/core.hpp>

#include <stan/math/prim/fun/inv_logit.hpp>

#include <cmath>


namespace stan {

namespace math {


template <typename T>

inline fvar<T> Phi_approx(const fvar<T>& x) {

  using std::pow;

  return inv_logit(0.07056 * pow(x, 3.0) + 1.5976 * x);

}


}  // namespace math

}  // namespace stan

#endif

core.hpp

meta.hpp

stan::math::Phi_approx
fvar< T > Phi_approx(const fvar< T > &x)
Return an approximation of the unit normal cumulative distribution function (CDF).
Definition Phi_approx.hpp:23

stan::math::pow
fvar< T > pow(const fvar< T > &x1, const fvar< T > &x2)
Definition pow.hpp:19

stan::math::inv_logit
fvar< T > inv_logit(const fvar< T > &x)
Returns the inverse logit function applied to the argument.
Definition inv_logit.hpp:20

stan
The lgamma implementation in stan-math is based on either the reentrant safe lgamma_r implementation ...
Definition fvar.hpp:9

inv_logit.hpp

stan::math::fvar
This template class represents scalars used in forward-mode automatic differentiation,...
Definition fvar.hpp:40