ifftshift¶

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

The inverse of fftshift. Although the even length ‘x’ is the same, the function of the odd length ‘x’ is different. An example.

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(gpu:0), stop_gradient=True,
#        [ 0.        ,  0.66666669,  1.33333337, -1.33333337, -0.66666669])

res = paddle.fft.ifftshift(fftfreq_xp)
print(res)
# Tensor(shape=[5], dtype=float32, place=Place(gpu:0), stop_gradient=True,
#        [ 1.33333337, -1.33333337, -0.66666669,  0.        ,  0.66666669])