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Phi_approx.hpp
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1 #ifndef STAN_MATH_PRIM_SCAL_FUN_PHI_APPROX_HPP
2 #define STAN_MATH_PRIM_SCAL_FUN_PHI_APPROX_HPP
3
4 #include <boost/math/tools/promotion.hpp>
5 #include <stan/math/prim/scal/fun/inv_logit.hpp>
6
7 namespace stan {
8 namespace math {
9
21 template <typename T>
22 inline typename boost::math::tools::promote_args<T>::type
23 Phi_approx(T x) {
24 using std::pow;
25 return inv_logit(0.07056 * pow(x, 3.0) + 1.5976 * x);
26 }
27
28 }
29 }
30
31 #endif
stan
Definition: log_sum_exp.hpp:8
stan::math::inv_logit
fvar< T > inv_logit(const fvar< T > &x)
Definition: inv_logit.hpp:14
stan::math::Phi_approx
boost::math::tools::promote_args< T >::type Phi_approx(T x)
Approximation of the unit normal CDF.
Definition: Phi_approx.hpp:23
stan::math::pow
fvar< T > pow(const fvar< T > &x1, const fvar< T > &x2)
Definition: pow.hpp:17
inv_logit.hpp

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