what about numpy.ma? Those are marked array. But they won't be the fastest.

Fred

On Wed, May 2, 2012 at 12:16 PM, Wolfgang Kerzendorf
<[email protected]> wrote:
> Hi all,
>
> I'm currently writing a code that needs three dimensional data (for the 
> physicists it's dimensions are atom, ion, level). The problem is that not all 
> combinations do exist (a sparse array). Sparse matrices in scipy only deal 
> with two dimensions. The operations that I need to do on those are running 
> functions like exp(item/constant) on all of the items. I also want to sum 
> them up in the last dimension. What's the best way to make a class that takes 
> this kind of data and does the required operations fast. Maybe some 
> phycisists have implemented these things already. Any thoughts?
>
> Cheers
>   Wolfgang
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