[Numpy-discussion] Re: ndarray.fill and ma.array.filled

Tim Hochberg tim.hochberg at cox.net
Fri Apr 7 18:44:02 CDT 2006


Sasha wrote:

>On 4/7/06, Tim Hochberg <tim.hochberg at cox.net> wrote:
>  
>
>>[...]
>>Perhaps MaskedArray should inherit from ndarray for the time being. Many
>>of the methods would need to reimplemented anyway, but it would make
>>asanyarray work. Someone was just complaining about asarray munging his
>>arrays. That's correct behaviour, but it would be nice if asanyarray did
>>the right thing. I suppose we could just special case asanyarray to
>>ignore MaskedArrays, that might be better since it's less constraining
>>from an implementation side too.
>>
>>    
>>
>Just for the record.  Currently MA does not inherit from ndarray. 
>  
>
Right, I checked that. That's why asanyarray won't work now with MA 
(unless someone changed the implementation of that while I wan't looking.

>There are some benefits to be gained from changing MA design from
>containment to inheritance, by I am very sceptical about the use of
>inheritance in the array setting.
>  
>
That's probably a sensible position.

Still it would be nice to have asanyarray pass masked arrays through 
somehow.  I haven't thought this through very well, but I wonder if it 
would make sense for asanyarray to pass any object that supplies 
__array__. I'm leary of special casing asanyarray just for MA; somehow 
that seems the wrong approach.

>>This may be an oportune time to propose something that's been cooking in
>>the back of my head for a week or so now: A stripped down array
>>superclass.
>>    
>>
>
>This is a very worthwhile idea and I hate to see it burried in a
>non-descriptive thread.  I've copied your proposal to the wiki at
><http://projects.scipy.org/scipy/numpy/wiki/ArraySuperClass>.
>  
>
Thanks for doing that. I'm glad you like the general idea. I do plan to 
write it through and try to get a better handle on what this would 
entail and what the consequences would be. However, I'm not sure exactly 
when I'll get around to it so it's probably better that a rough draft be 
out there for people to think about in the interim.

-tim


>
>  
>






More information about the Numpy-discussion mailing list