[Numpy-discussion] bug ! arr.mean() outside arr.min() .. arr.max() range

Travis Oliphant oliphant.travis at ieee.org
Fri Aug 11 17:06:12 CDT 2006

Sebastian Haase wrote:
> Hi!
> b is a non-native byteorder array of type int16
> but see further down: same after converting to native ...
>>>> repr(b.dtype)
> 'dtype('>i2')'

The problem is no-doubt related to "wrapping" for integers.  Your total is
getting too large to fit into the reducing data-type.

What does

d.sum() give you?

You can add d.mean(dtype='d') to force reduction over doubles.


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