idst — SciPy v1.15.3 Manual (original) (raw)

scipy.fftpack.

scipy.fftpack.idst(x, type=2, n=None, axis=-1, norm=None, overwrite_x=False)[source]#

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

Parameters:

xarray_like

The input array.

type{1, 2, 3, 4}, optional

Type of the DST (see Notes). Default type is 2.

nint, 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].

axisint, 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_xbool, optional

If True, the contents of x can be destroyed; the default is False.

Returns:

idstndarray 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.

Added in version 0.11.0.