fftshift¶

paddle.fft. fftshift ( x, axes=None, name=None ) [source]

Shift the zero-frequency component to the center of the spectrum.

This function swaps half spaces for all the axes listed (all by default). Note that y[0] is the Nyquist component only if len(x) is even.

Parameters

n (int) – Dimension inputed.
axes (int|tuple, optional) – The axis on which to move. The default is none, which moves all axes. Default is None.
name (str, optional) – The default value is None. Normally there is no need for user to set this property. For more information, please refer to Name.

Returns

Tensor. The shifted tensor.

Examples

           >>> import paddle

>>> fftfreq_xp = paddle.fft.fftfreq(5, d=0.3)
>>> print(fftfreq_xp)
Tensor(shape=[5], dtype=float32, place=Place(cpu), stop_gradient=True,
[0., 0.66666669, 1.33333337, -1.33333337, -0.66666669])

>>> res = paddle.fft.fftshift(fftfreq_xp)
>>> print(res)
Tensor(shape=[5], dtype=float32, place=Place(cpu), stop_gradient=True,
[-1.33333337, -0.66666669, 0., 0.66666669, 1.33333337])

          