[Numpy-discussion] Detect subclass of ndarray

[Alan G Isaac]

On Sat, 24 Mar 2007, Travis Oliphant apparently wrote: 
> I'd be fine with an error raised on matrix multiplication 
> (as long as dot is not changed).   In other words, I'd 
> like to see 1-d arrays always interpreted the same way (as 
> row vectors) when used in matrix multiplication. 

My preference would be for matrix multiplication with 1d 
arrays to always raise an error. Anything else is too 
"implicit".

As a second choice, having them always interpreted as 
a specific kind of vector (either row or colum, as long as 
its *always* the same) is equivalent to me.

But shouldn't there be a clear justification of such 
implicit conversion?  Is it really so useful?

Cheers,
Alan