fallout.py 文件源码

def phi(self, x):
        """Normalized Downwind and Upwind Distribution.

In order to predict upwind fallout and at the same time preserve normalization, a
function phi is empirically inserted."""
        w = (self.L_0 / self.L) * (x / (self.s_x * self.a_1))
        return norm.cdf(w)