[Numpy-discussion] argsort question

Robert Cimrman cimrman3 at ntc.zcu.cz
Thu Jun 8 07:44:49 CDT 2006


Hi all,

I have just lost some time to find a bug related to the fact, that 
argsort does not preserve the order of an array that is already sorted, 
see the example below. For me, it would be sufficient to mention this 
fact in the docstring, although having order preserving argsort is also 
an option :). What do the developers think?

In [33]:a = nm.zeros( 10000 )
In [34]:b = nm.arange( 10000 )
In [35]:nm.alltrue( nm.argsort( a ) == b )
Out[35]:False

r.




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