`scipy.fftpack._realtransforms:idst`

source: /scipy/fftpack/_realtransforms.py :555

Signature

   def     idst (    x    ,    type    =  2   ,    n    =  None   ,    axis    =  -1   ,    norm    =  None   ,    overwrite_x    =  False     )

Summary

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

Parameters

x : array_like: The input array.
type : {1, 2, 3, 4}, 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.

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.

Aliases