[Numpy-discussion] metadata and metabehavior for arrays (for scipy.base or Numeric3)
Colin J. Williams
cjw at sympatico.ca
Thu Apr 7 05:57:36 EDT 2005
konrad.hinsen at laposte.net wrote:
> On Apr 7, 2005, at 10:06, David M. Cooke wrote:
>> Hmm, I had misread your previous code. Here it is again, made more
>> specific, and I'll assume this function lives in the ndarray package
>> (as there is more than one package that defines ufuncs)
> At the moment, there is one in Numeric and one in numarray. The Python
> API of both is nearly or fully identical.
>> The thing is obj.__ufunc__ must understand about the *particular*
>> object cos: the ndarray one. I was thinking more along the lines of
> No, it must only know the interface. In most cases, it would do
> something like
> class MyArray:
> def __ufunc__(self, ufunc):
> return MyArray(apply(ufunc, self.data))
>> obj.__ufunc__('cos'), where the name is passed instead.
> That's also an interesting option. It would require the implementing
> class to choose an appropriate function from an appropriate module.
> Alternatively, it would work if ufuncs were also accessible as methods
> on array objects.
Yes, perhaps with a slightly different name (say Cos vs cos) to
distinguish between methods and functions. Since they don't require
arguments, the methods would not require parentheses.
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