[Numpy-discussion] Output dtype

Bruce Southey bsouthey at gmail.com
Wed Jan 12 11:20:39 EST 2011

On 12/13/2010 04:53 PM, Keith Goodman wrote:
> On Mon, Dec 13, 2010 at 12:20 PM, Bruce Southey<bsouthey at gmail.com>  wrote:
>> Unless something has changed since the docstring was written, this is
>> probably an inherited 'bug' from np.mean() as the author expected that
>> the docstring of mean was correct. For my 'old' 2.0 dev version:
>>   >>>  np.mean( np.array([[0,1,2,3,4,5]], dtype='float32'), axis=1).dtype
>> dtype('float32')
>>   >>>  np.mean( np.array([[0,1,2,3,4,5]], dtype='float32')).dtype
>> dtype('float64')
> Are you saying the bug is in the doc string, the output, or both? I
> think it is both; I expect the second result above to be float32.
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Sorry as I filed a bug for this as 1710
but this is the same as ticket 518 that is listed as won't fix:

My expectation is that the internal and output dtypes should not depend 
on the axis argument. Related to this, I also think that internal dtypes 
should be the same as the output dtype (see ticket 465 regarding the 
internal precision http://projects.scipy.org/numpy/ticket/465).

If the consensus is still won't fix then I or someone needs to edit the 
documentation to clearly reflect these situations.


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