Re: [Pyobjc-dev] Passing an numeric array to objectiveC

[Bob I. <bo...@re...>]

On Feb 4, 2006, at 10:40 PM, Ronald Oussoren wrote:

>
> On 5-feb-2006, at 3:13, Brian O'Brien wrote:
>
>>
>> On 4-Feb-06, at 6:06 PM, Bob Ippolito wrote:
>>
>>> On Feb 4, 2006, at 4:59 PM, Brian O'Brien wrote:
>>>
>>>> If, from python I pass a numeric array to an objectiveC method/ 
>>>> selector,  how do I access the data in the numeric array?
>>>
>>> I'm guessing it'll come over as NSData... so you'd use the bytes  
>>> message to get at the pointers to the raw array.
>>
>> Tell me... Does the numeric array know is dimensions, if
>> so do you think they are passed on to the NSData type?
>
> We don't have specific support for numeric arrays. It will either  
> be passed as an NSData or a generic python object. In either case  
> you'll have to the the Python C API to access most features of  
> numeric arrays.
>
> BTW. I suppose you're using Numeric, numpy, numarray or scipy core  
> (or whatever the prefered array implementation is these days...)

It would probably make sense to add generic valueForKey: support to  
the proxy subclasses so that you can get at most of the information  
that would be useful from a Numeric array.  "shape" is a tuple  
attribute and typecode, itemsize are no-argument functions... so that  
would probably work fine.

-bob