[Numpy-discussion] Detect subclass of ndarray

Alan G Isaac aisaac@american....
Sat Mar 24 12:31:56 CDT 2007

On Sat, 24 Mar 2007, Charles R Harris apparently wrote: 
> I think it is reasonable to raise an exception in this 
> case, but that is not how numpy currently works, so it is 
> a larger policy decision that I can't make on my own. For 
> the case under consideration it is possible to define 1-D 
> to 2-D rules that are consistent and work, so I am 
> thinking of adding those to the __mul__ operator of the 
> matrix class. However, as you say, such rules are more 
> likely to let some errors slip by. In essence, it is 
> rather like type conversion in mixed expressions: 
> convenient, but open to error. 

Your proposed change is also not how numpy currently works.
If any change is introduced, I hope it will be to raise an 


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