[Numpy-discussion] new question - summing a list of arrays

Manuel Metz mmetz@astro.uni-bonn...
Tue Mar 18 10:42:43 CDT 2008


Chris Withers wrote:
> Hi All,
> 
> Say I have an aribtary number of arrays:
> 
> arrays = [array([1,2,3]),array([4,5,6]),array([7,8,9])]
> 
> How can I sum these all together?
> 
> My only solution so far is this:
> 
> sum = arrays[0]
> for a in arrays[1:]:
>    sum += a
> 
> ...which is ugly :-S
> 
> cheers,
> 
> Chris

sum = sum(array(sum(a) for a in arrays]))

Works also if arrays in list have different length ...

Manuel


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