[Numpy-discussion] missing use case
Alan G Isaac
aisaac@american....
Tue Mar 27 12:57:57 CDT 2007
Hi Zachary,
I think your response highlights very well
the apparent design flaw.
Here is your response to my request for a use case where
iteration over a matrix should yield matrices:
do not iterate!
Does some part of you not find that just a little bizarre?!
As for offering as a use case that with a matrix M
you are allowed to use M[0] instead of M[0,:]
when you want the first row as a matrix,
I really cannot take that trivial convenience seriously
as the basis of a fundamental design decision.
However there is no sympathy for my view on this,
so I am not debating it any more. Instead I have asked
a simple question: what use case is this design decision
supporting? I am interested in this so that I can see into
the decision better.
Nowith Chris proposes that "M[i] == M[i,:] by definition".
If so, that is an design-based answer to my question.
I agree that M[i,:] should return a matrix.
But my understanding was different:
I thought M[i] relied on standard Python idexing
while M[i,:] was numpy indexing.
Cheers,
Alan Isaac
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