[Numpy-discussion] Multiarray PEP

Perry Greenfield perry at stsci.edu
Thu Feb 17 08:29:22 CST 2005


I'm generally going to refrain from making comments since it usually is 
obvious what we prefer. But there may be exceptions (perhaps a reminder 
of past arguments, a desire to change numarray behavior, or clarify 
what the issue is).

On Feb 17, 2005, at 2:25 AM, Travis Oliphant wrote:

>
> I am looking for feedback on the PEP.   Of particular interest is the 
> specification of multidimensional indexing that I've outlined.  I 
> think it is mostly the same as numarray (I'd love some feedback to be 
> sure about that), except for the fact that X[K] where K is a a single 
> integer index array can do 1-d indexing similar to MATLAB.  The 
> equivalent numarray indexing is available as X[K,].    Now that I've 
> specified what is to happen, I think it won't be very difficult to 
> code.
Could you clarify this with an example? I'm not quite sure what 
alternatives you are addressing.

> I would also like some help on resolving the type issue.   Is it 
> important to have hierarchial classes defined (probably in Python) 
> that can be used to check and/or specify type or are functions that 
> check for various properties, fine.   Right now x.type is specified as 
> an attribute but the attribute could be replaced by a method.  What to 
> return is the biggest question.

I'll just note that the hierarchial approach allows simpler tests for 
kinds of types (e.g., is the type an integer type) rather than doing 
something like ntype in [Int16, Int8,...].

Thanks, Perry





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