8000 argsort default axis + axis=None (Trac #391) · Issue #989 · numpy/numpy · GitHub
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numpy-gitbot opened this issue Oct 19, 2012 · 2 comments
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argsort default axis + axis=None (Trac #391) #989

numpy-gitbot opened this issue Oct 19, 2012 · 2 comments
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00 - Bug component: numpy._core

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Original ticket http://projects.scipy.org/numpy/ticket/391 on 2006-11-28 by @pierregm, assigned to unknown.

Folks,
The default axis for argsort (method & function) is -1, when it's None for argmin and argmax.
Moreover, forcing the axis to None raises a TypeError: an integer is required exception.

>>>import numpy as N
>>>N.version.version
'1.0.1.dev3460'
>>>a=N.array([[1,3],[2,4]])
>>>N.argmin(a), N.argmax(a), 
(0,3)
>>>N.argsort(a)
array([[0, 1],
       [0, 1]])
>>>N.argsort(a,None)
/usr/lib64/python2.4/site-packages/numpy/core/fromnumeric.py in argsort(a, axis, kind)
    192     except AttributeError:
    193         return _wrapit(a, 'argsort', axis, kind)
--> 194     return argsort(axis, kind)
    195
    196 def argmax(a, axis=None):

TypeError: an integer is required
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@teoliphant wrote on 2006-12-01

argsort and sort are special cases because sort does an in-place sort. None has never been accepted for these. I suppose it could be, but we can't change the default axis at this point at least until 1.1 which will not be for a year or two.

It would be possible for argsort to accept None and (maybe) for sort to accept None as well.

Bring it up on the list.

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@teoliphant wrote on 2006-12-02

Argsort now accepts None as does the sort function. The sort method is harder to write to accept None and seems like an odd beast (an in-place ravel). The default axis arguments will not change until possibly a later version of NumPy (at least 1.1)

@numpy-gitbot numpy-gitbot mentioned this issue Oct 23, 2012
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