[Numpy-discussion] Initialization of array?

Konrad Hinsen hinsen at cnrs-orleans.fr
Thu Nov 30 08:25:36 CST 2000


> I had another look at the definition of "ones" and of another routine
> I frequently use: arange. It appears that even without rewriting them
> in C, some speedup can be achieved:
> 
>  - in ones(), the + 1 should be done "in place", saving about 15%, more
>    if you run out of processor cache:

I'd also try assignment in place:

def ones(shape, typecode='l', savespace=0):
   a = zeros(shape, typecode, savespace)
   a[len(shape)*[slice(0, None)]] = 1
   return a

Konrad.
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