[Numpy-discussion] Importance of order when summing values in anarray

Hanni Ali hanni.ali@gmail....
Tue Dec 9 09:00:07 CST 2008


Hi Bruce,

Ahh, but I would have thought the precision for the array operation would be
the same no matter which values I wish to sum? The array is in float64 in
all cases.

I would not have thought altering the type of the integer values would make
any difference as these indices are all below 5 milllion.

Perhaps I have misunderstood your suggestion could you expand.

Cheers,

Hanni


Also, increase the numerical precision as that may depend on your
> platform especially given the input values above are ints. Numpy has
> float128 and int64 that will minimize rounding error.
>
> Bruce
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