wavelets.py 文件源码

def frequency(self, w, s=1.0):
        """Frequency representation of derivative of Gaussian.

        Parameters
        ----------
        w : float
            Angular frequency. If `s` is not specified, i.e. set to 1,
            this can be used as the non-dimensional angular
            frequency w * s.
        s : float
            Scaling factor. Default is 1.

        Returns
        -------
        out : complex
            Value of the derivative of Gaussian wavelet at the
            given time
        """
        m = self.m
        x = s * w
        gamma = scipy.special.gamma
        const = -1j ** m / gamma(m + 0.5) ** .5
        function = x ** m * np.exp(-x ** 2 / 2)
        return const * function