On 17/04/2008, Zachary Pincus wrote:
> But even if indices = array, one still needs to do something like:
> for index in indices: histogram[index] += 1
>
> Which is slow in python and fast in C.
>
I haven't tried this, but if you want the sum in C you could do
for x in unique(indices):
histogram[x] = (indices==x).sum()
Of course, this just replaces an O(N log N) algorithm by an O(N * M)
(M is the number of bins), which is only going to be worth it for very
small M.
Peter
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