[Numpy-discussion] custom accumlators
tim.hochberg at ieee.org
Fri Jan 5 17:57:31 EST 2007
Tim Hochberg wrote:
> A. M. Archibald wrote:
>> Really it would be nice if what vectorize() returned were effectively
>> a ufunc, supporting all the various operations we might want from a
>> ufunc (albeit inefficiently). This should not be difficult, but I am
>> not up to writing it this evening.
> You might want to look at frompyfunc:
> def expmave2(x, k):
> def expmave_sub(a, b):
> return a + k * (b - a)
> return np.frompyfunc(expmave_sub, 2, 1).accumulate(x)
> It's amazing what you find when you dig around.
I guess that this should have an astype since this comes back as an
object array. It would be cool if there was a way to have it return
certain types, just for efficiency reasons, but that would require
actual work on someones part.
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