Strange numpy.argmax behavior on object arrays in numpy 1.0.

Charles R Harris charlesr.harris at gmail.com
Sun Oct 29 20:17:34 CST 2006


On 10/29/06, Tom Denniston <tom.denniston at alum.dartmouth.org> wrote:
>
> Oh.  My mistake. I thought I had an array of 2 objects which were ints.  I
> actually had an array of one list of 2 ints.  It works properly if I
> construct the array properly.
>

I think there is actually a bug here:

In [61]: sort(array([3,2], dtype=object))
Out[61]: array([2, 3], dtype=object)

In [62]: argmax(array([2,3], dtype=object))
Out[62]: 0

See, the sort works fine. I suspect argmax is using the wrong comparison
function. I was just pointing out that sometimes it is hard to know what is
going on with objects.

Chuck
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