[Numpy-discussion] Detect subclass of ndarray

Colin J. Williams cjw@sympatico...
Sun Mar 25 07:48:30 CDT 2007


Alan G Isaac wrote:
> On Sat, 24 Mar 2007, Charles R Harris apparently wrote: 
>> Yes, that is what I am thinking. Given that there are only the two 
>> possibilities, row or column, choose the only one that is compatible with 
>> the multiplying matrix. The result will not always be a column vector, for 
>> instance, mat([[1]])*ones(3) will be a 1x3 row vector. 
> 
> 
> 
> Ack!  The simple rule `post multiply means its a column vector`
> would be horrible enough: A*ones(n)*B becomes utterly obscure.
> Now even that simple rule is to be violated??

It depends whether ones delivers an instance of the Matrix/vector class 
or a simple array.

I assume that, in the above A and B represent matrices.

Colin W.
> 
> Down this path lies madness.
> Please, just raise an exception.
> 
> Cheers,
> Alan Isaac



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