scipy.fftpack.dct does not work

[Bo Qiang]

Hi,

I am trying to use the DCT function but it seems like the function does not work. Here is the error message.

    w = fftpack.dct(v)

AttributeError: 'module' object has no attribute 'dct'

Thanks!

Bo

[Sebastian Wagner]

Hi,

First impression: looks like a user bug. Which version are you using,
how are you calling dct?

How it should work: (Winpython 32bit 2.7.8.2)

>>> import scipy.fftpack
>>> scipy.fftpack.dct(None)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File
"D:\WinPython-32bit-2.7.8.2\python-2.7.8\lib\site-packages\scipy\fftpack\realtransforms.py",
line 135, in dct
return _dct(x, type, n, axis, normalize=norm,
overwrite_x=overwrite_x)
File
"D:\WinPython-32bit-2.7.8.2\python-2.7.8\lib\site-packages\scipy\fftpack\realtransforms.py",
line 222, in _dct
n = tmp.shape[axis]
IndexError: tuple index out of range
# -> works
>>> from scipy import fftpack
>>> fftpack.dct(None)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File
"D:\WinPython-32bit-2.7.8.2\python-2.7.8\lib\site-packages\scipy\fftpack\realtransforms.py",
line 135, in dct
return _dct(x, type, n, axis, normalize=norm,
overwrite_x=overwrite_x)
File
"D:\WinPython-32bit-2.7.8.2\python-2.7.8\lib\site-packages\scipy\fftpack\realtransforms.py",
line 222, in _dct
n = tmp.shape[axis]
IndexError: tuple index out of range
# -> works

regards,
Sebastian

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[Bo Qiang]

Thanks!

I should use:

from scipy import fftpack

then it works.

Very new to python so learn bit by bit.