Hi Martin,

I agree it is a long-standing issue, and I was reminded of it by your
comment.  I have a draft PR at https://github.com/numpy/numpy/pull/25476
that does not change the old behaviour, but allows you to pass in a
start-stop array which behaves more sensibly (exact API TBD).

Please have a look!

Marten

Martin Ling <martin-nu...@earth.li> writes:

> Hi folks,
> 
> I don't follow numpy development in much detail these days but I see
> that there is a 2.0 release planned soon.
> 
> Would this be an opportunity to change the behaviour of 'reduceat'?
> 
> This issue has been open in some form since 2006!
> https://github.com/numpy/numpy/issues/834
> 
> The current behaviour was originally inherited from Numeric, and makes
> reduceat often unusable in practice, even where it should be the
> perfect, concise, efficient solution. But it has been impossible to
> change it without breaking compatibŃ–lity with existing code.
> 
> As a result, horrible hacks are needed instead, e.g. my answer here:
> https://stackoverflow.com/questions/57694003
> 
> Is this something that could finally be fixed in 2.0?
> 
> 
> Martin
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