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

[Jeffrey]

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

-- 

Jeffrey