[Numpy-discussion] please change mean to use dtype=float

Robert Kern robert.kern at gmail.com
Tue Sep 19 23:10:26 CDT 2006

Sebastian Haase wrote:
> I know that having too much knowledge of the details often makes one 
> forget what the "newcomers" will do and expect.

Please be more careful with such accusations. Repeated frequently, they can 
become quite insulting.

> We are only talking 
> about people that will a) work with single-precision data (e.g. large 
> scale-image analysis) and who b) will tend to "just use the default" 
> (dtype)  --- How else can I say this: these people will just assume that 
> arr.mean() *is* the mean of arr.

I don't understand what you mean, here. arr.mean() is almost never *the* mean of 
arr. Double precision can't fix that.

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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