[Numpy-discussion] use of concatenate with subclass of ndarray

[Bryce Hendrix]

Yup, we've decided to write custom concatenate & where methods. Thanks 
for all the help.

Bryce

Pierre GM wrote:
> On Thursday 29 March 2007 14:09:38 Bryce Hendrix wrote:
>   
>> I really should widen my tests before proclaiming success... If you
>> change the default units to "feet", the result of concatenating two
>> UnitArrays instances with "meters" units is a UnitArray with "feet".
>>     
>
> Not a surprise at all, and I should have thought about it:
>
> concatenate creates a plain ndarray first and ends up calling 
> Unit_array.__array_finalize__. As the caller has no unit yet 
> (it's a plain ndarray), the result gets the Unit_array.default_unit. 
>
> That's why you should really write a custom concatenate function that checks 
> the units of its inputs, and sets the unit of the output accordingly.
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