pipes.py 文件源码

def _f5(self, z):
        """
        Calculate function f5 from Hellstrom (1991)
        """
        B = self._delta*self._beta2 + self._beta1*self._beta12/self._gamma
        f5 = np.exp(self._beta*z) \
            * (self._beta2*np.cosh(self._gamma*z) + B*np.sinh(self._gamma*z))
        return f5