Bug of argsort with arrays of size 3

[juanmabelda]

It seems as argsort has a bug for dimension 3 arrays in an specific order.

For instance if I wrote

import numpy as np

np.argsort(array([2,3,1])

The returned value is:
array([2, 0, 1])

If I change the order of the numbers (i.e. [1,2,3]) the function works well.

I have cross checked the malfunction in python 2.7.6 with numpy 1.8.2 and python 3.5.2 with numpy version 1.11.1 both in windows and linux.

[seberg]

And why do you expect something else? Seems like the right answer to me:

In [5]: np.array([2,3,1])[np.argsort(np.array([2,3,1]))]
Out[5]: array([1, 2, 3])

In [6]: np.argsort(np.array([2,3,1]))
Out[6]: array([2, 0, 1])

EDIT: Copied the second thing wrong, fixed

[juanmabelda]

'got it. Sorry. I misanderstood the help documentation.

[eric-wieser]

Duplicate of #8757