[Numpy-discussion] New functions.

Robert Kern robert.kern@gmail....
Wed Jun 1 11:01:37 CDT 2011


On Wed, Jun 1, 2011 at 10:44, Craig Yoshioka <craigyk@me.com> wrote:
> would anyone object to fixing the numpy mean and stdv functions, so that they always used a 64-bit value to track sums, or so that they used a running calculation.  That way
>
> np.mean(np.zeros([4000,4000],'f4')+500)
>
> would not equal 511.493408?

Yes, I object. You can set the accumulator dtype explicitly if you
need it: np.mean(arr, dtype=np.float64)

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth."
  -- Umberto Eco


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