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# scipy.fftpack.idst

`scipy.fftpack.``idst`(x, type=2, n=None, axis=-1, norm=None, overwrite_x=False)

  Return the Inverse Discrete Sine Transform of an arbitrary type sequence.

  Parameters: | x : array_like The input array. type : {1, 2, 3}, optional Type of the DST (see Notes). Default type is 2. n : int, optional Length of the transform. If `n < x.shape[axis]`, x is truncated. If `n > x.shape[axis]`, x is zero-padded. The default results in `n = x.shape[axis]`. axis : int, optional Axis along which the idst is computed; the default is over the last axis (i.e., `axis=-1`). norm : {None, ‘ortho’}, optional Normalization mode (see Notes). Default is None. overwrite_x : bool, optional If True, the contents of x can be destroyed; the default is False.
  Returns: | idst : ndarray of real The transformed input array.

  See also

  `dst`
    Forward DST

  Notes

  ‘The’ IDST is the IDST of type 2, which is the same as DST of type 3.

  IDST of type 1 is the DST of type 1, IDST of type 2 is the DST of type 3, and IDST of type 3 is the DST of type 2. For the definition of these types, see `dst`.

  New in version 0.11.0.