1 #ifndef STAN_MATH_REV_SCAL_FUN_PHI_HPP
2 #define STAN_MATH_REV_SCAL_FUN_PHI_HPP
11 class Phi_vari :
public op_v_vari {
13 explicit Phi_vari(vari* avi) :
14 op_v_vari(
stan::math::
Phi(avi->val_), avi) {
17 static const double NEG_HALF = -0.5;
20 *
std::exp(NEG_HALF * avi_->val_ * avi_->val_);
67 return var(
new Phi_vari(a.
vi_));
const double INV_SQRT_TWO_PI
Independent (input) and dependent (output) variables for gradients.
fvar< T > exp(const fvar< T > &x)
vari * vi_
Pointer to the implementation of this variable.
fvar< T > Phi(const fvar< T > &x)