On Apr 12, 2010, at 5:54 PM, Warren Weckesser wrote:
A bit more generalization of `by` gives behavior like matlab's
accumarray
(http://www.mathworks.com/access/helpdesk/help/techdoc/ref/accumarray.html
),
which I partly cloned here:
[This would be a link to the scipy cookbook, but scipy.org is not
responding.]
Reading the accumarray docstring, it does seem related, but they use
the "subs" array as an index into the original array (instead of an
index into the "output" array like Robert's simplification). I do
like the Matlab functionality, but would propose a different reduction
function: reduceover to implement it.
It also feels like we should figure out different kinds of reductions
for generalized ufuncs as well. If anyone has a primer on
generalized ufuncs, I would love to see it. Isn't a reduction on a
generalized ufunc just another generalized ufunc? Perhaps we could
automatically create these "reduced generalized ufuncs"
I would love to explore just how general these generalized ufuncs are
and what can be subsumed by them.
-Travis
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