cupyx.scipy.fftpack.ifft(x, n=None, axis=-1, overwrite_x=False, plan=None)

Compute the one-dimensional inverse FFT.

  • x (cupy.ndarray) – Array to be transformed.
  • n (None or int) – Length of the transformed axis of the output. If n is not given, the length of the input along the axis specified by axis is used.
  • axis (int) – Axis over which to compute the FFT.
  • overwrite_x (bool) – If True, the contents of x can be destroyed.
  • plan (cupy.cuda.cufft.Plan1d) –

    a cuFFT plan for transforming x over axis, which can be obtained using:

    plan = cupyx.scipy.fftpack.get_fft_plan(x, axis)

    Note that plan is defaulted to None, meaning CuPy will use an auto-generated plan behind the scene.


The transformed array which shape is specified by n and type will convert to complex if that of the input is another.

Return type:



The argument plan is currently experimental and the interface may be changed in the future version.