transform_cpu.py 文件源码

def xx2k(self, xx):
        """
        Private: oversampled FFT on CPU

        Firstly, zeroing the self.k_Kd array
        Second, copy self.x_Nd array to self.k_Kd array by cSelect
        Third: inplace FFT
        """
#         dd = numpy.size(self.Kd)      
        output_x = numpy.zeros(self.Kd, dtype=self.dtype,order='C')
#         output_x[crop_slice_ind(xx.shape)] = xx
        output_x.flat[self.KdCPUorder]=xx.flat[self.NdCPUorder]
        k = numpy.fft.fftn(output_x, self.Kd, range(0, self.ndims))

        return k