python-quantities-developers team mailing list archive

[Tony S Yu <tonyyu@xxxxxxx>]

On Jun 23, 2009, at 4:18 PM, Darren Dale wrote:

> There was some discussion at numpy-discussion of what needs to be  
> done before numpy-1.4 is released. I took the opportunity to request  
> an ndarray method that could be called by ufuncs on the way in in  
> order to better support subclassing and to make ufuncs more  
> generally useful to subclasses. I also posted a new beta (0.5b5) at  
> the python package index which addresses a couple bugs identified by  
> Tony Yu (welcome Tony!) and a few other less-critical items.
>
> I'll have a bit of free time to pick up development again in the  
> nights and weekends over the summer, and am looking forward to  
> continuing work on unit tests and documentation. Hopefully the  
> proposed ufunc mechanism will gain support and be implemented in the  
> near future, which should allow development of a MaskedQuantity,  
> allow things like m+mm, and allow dimensional analysis to be  
> performed before modifying array data. If you have questions or  
> comments about this feature for the numpy mailing list, please speak  
> up, I would prefer to make the most of this opportunity to improve  
> numpy.
>
> Cheers,
> Darren

Hey Darren,

I was wondering if you've made any attempts to write a patch to  
implement this ufunc mechanism.

There were supportive comments on the numpy mailing list, but no one  
sounded enthusiastic enough to actually write code. A rough  
implementation of the proposal would go a long way towards getting  
this in numpy 1.4.

That said, I don't think I'd be capable of writing the code. I don't  
really know the numpy internals very well---I don't even have much  
experience subclassing numpy arrays. (I know it's pretty bad form to  
suggest something, but not offer any help.)

Cheers,
-Tony

PS Thanks for adding me on the list