ps2d.py 文件源码

def k_xy(self):
        """
        The k-space coordinates along the (X, Y) spatial dimensions,
        which describe the spatial frequencies.

        NOTE:
        k = 2*pi * f, where "f" is the spatial frequencies, and the
        Fourier dual to spatial transverse distances x/y.

        Unit: [Mpc^-1]
        """
        f_xy = fftpack.fftshift(fftpack.fftfreq(self.Nx, d=self.d_xy))
        k_xy = 2*np.pi * f_xy
        return k_xy