[SciPy-User] scipy.stats.kendalltau bug?

eat e.antero.tammi@gmail....
Sat Jul 28 12:06:25 CDT 2012


Hi,

On Sat, Jul 28, 2012 at 7:48 PM, Jeffrey <zfyuan@mail.ustc.edu.cn> wrote:

> 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.
>
I can confirm this, like
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.


My 2 cents,
-eat

>
> --
>
> Jeffrey
>
>
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