On 07/29/2012 12:23 AM, Jeffrey wrote:
> Dear all,
>
> The sentences bellow will always raise an Error or Exception just
> as follows, which is a little anomaly. Is this a bug?
>
> >>> u1=numpy.random.rand(100000)
> >>> u2=numpy.random.rand(100000)
> >>> scipy.stats.kendalltau(u1,u2)
> ---------------------------------------------------------------------------
>
> AttributeError Traceback (most recent call
> last)
> /home/zfyuan/phd/paper1/pyvine_lap/<ipython-input-28-98f367090ed1> in
> <module>()
> ----> 1 sp.stats.kendalltau(u1,u2)
>
> /usr/lib64/python2.7/site-packages/scipy/stats/stats.pyc in
> kendalltau(x, y, initial_lexsort)
> 2673
> 2674 tau = ((tot - (v + u - t)) - 2.0 * exchanges) / \
> -> 2675 np.sqrt((tot - u) * (tot - v))
> 2676
> 2677 # what follows reproduces the ending of Gary Strangman's
> original
>
>
> AttributeError: sqrt
>
Sorry, I didn't describe this bug with details. What I mean is that when
the two array have larger length, for example with length 100000, then
it is more possible that the Error would occur.
My scipy version is 0.9.0 and numpy is 1.6.2.
Thanks a lot for your answering.
In []: os.sys.version
Out[]: '2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]'
In []: np.version.version
Out[]: '1.6.0'
In []: sp.version.version
Out[]: '0.9.0'
In []: stats.kendalltau(rand(77929), rand(77929))
Out[]: (0.0060807135427758865, 0.010891543687108114)
In []: stats.kendalltau(rand(77939), rand(77939))
------------------------------------------------------------
Traceback (most recent call last):
File "<ipython console>", line 1, in <module>
File "C:\Python27\lib\site-packages\scipy\stats\stats.py", line 2675, in kendalltau
np.sqrt((tot - u) * (tot - v))
AttributeError: sqrt
There really seems to be odd problem above a certain length of arrays.