scipy.fft.idst¶

scipy.fft.
idst
(x, type=2, n=None, axis= 1, norm=None, overwrite_x=False, workers=None)[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. Ifn > x.shape[axis]
, x is zeropadded. The default results inn = 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.
 workersint, optional
Maximum number of workers to use for parallel computation. If negative, the value wraps around from
os.cpu_count()
. Seefft
for more details.
 Returns
 idstndarray of real
The transformed input array.
See also
dst
Forward DST
Notes
‘The’ IDST is the IDSTII, which is the same as the normalized DSTIII.
The IDST is equivalent to a normal DST except for the normalization and type. DST type 1 and 4 are their own inverse and DSTs 2 and 3 are each other’s inverses.