NumPy loop efficiency

[Carlos Alberto Reis Ribeiro]

>It does create a temporary array. Getting rid of this would be a lot
>of work, array expressions would have to use lazy evaluation.

(out of the top of my mind; I dont have Numeric installed on my home 
computer, and have no way to test it right now)

The intermediate array is not really needed, but the python expresion 
evaluator have no way to know it. However, something like the ufuncs could 
be used. For instance, something like this could be done (the names are 
just examples):

   z = arrayadd(a, b, c)

or the more generic solution:

   z = arraymap(add, a, b, c)

The first one could be optimized for the most common cases (I'm sure adding 
arrays is one of these operations).


Carlos Ribeiro