[Numpy-discussion] iterate over multiple arrays

David Froger david.froger@gmail....
Mon Sep 12 01:52:02 CDT 2011


Hy everybody,

I'm wondering what is the (best) way to apply the same function to multiple
arrays.

For example, in the following code:

from numpy import *

def f(arr):
     return arr*2

a = array( [1,1,1] )
b = array( [2,2,2] )
c = array( [3,3,3] )
d = array( [4,4,4] )

a = f(a)
b = f(b)
c = f(c)
d = f(d)

I would like to replace :

a = f(a)
b = f(b)
c = f(c)
d = f(d)

with something like that, but which really modify a,b,c and d:

for x in [a,b,c,d]:
    x = f(x)

So having something like a pointer on the arrays.

Thanks for your help !

David
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