transform.py 文件源码

def find_s0(self):
        """Find the smallest resolvable scale by finding where the
        equivalent fourier period is equal to 2 * dt. For a Morlet
        wavelet, this is roughly 1.
        """
        dt = self.dt

        def f(s):
            return self.fourier_period(s) - 2 * dt
        return scipy.optimize.fsolve(f, 1)[0]