[Numpy-discussion] matrix indexing question (final post)

Zachary Pincus zpincus@stanford....
Wed Mar 28 16:39:35 CDT 2007


It's because the property that A[i] == A[i,...] is much more  
important to most numpy users than the results of a particular (mis) 
use of the matrix class.

This has been explained in many different contexts over many  
different email messages by many different people. You're not looking  
at the big picture, which has been fairly explicitly spelled out by  
myself and others. I'm not even sure why I'm replying at this point.

Zach


On Mar 28, 2007, at 3:25 PM, Alan Isaac wrote:

> On Wed, 28 Mar 2007, Robert Kern wrote:
>> People have been giving you reasons, over and over again.
>> You are simply refusing to listen to them.
>
> Exploring whether the reasoning is adequate is not the same
> as refusing to listen.  I do not presume my view is correct.
>
>> You have a use case for arrays being the iterates.  You
>> are presuming that the only argument that can beat that is
>> another use case for matrix objects being the iterates.
>> This is not true; there are other principles at work.
>
> Put slightly differently:
> given the surprising passion of the attacks at the
> suggestion that perhaps iteration over a matrix might more
> consistently yield arrays, I presumed there must be *many*
> instances in which it was obviously desirable that such
> iteration should yield matrices.  So I asked to see some.
>
> In the context of this discussion, I found the (lack of)
> responses very interesting.  Even in your thoughtful
> response it proved irrelevant rather than important for
> iteration over matrices to yield matrices.
>
> I understand that some people claim that a general principle
> of consistency is involved.  I have not been able to
> understand this particular design decision as a matter of
> consistency, and I have tried to say why.  However I am just
> a user (and supporter) of numpy, and as indicated in other
> posts, I make no pretense of deep insight into the design
> decisions.  In this case, I simply wanted to open
> a discussion of a design decision, not win an "argument".
>
> Anyway, I understand that I am being perceived as
> bull-headed here, so I'll let this go.  Thanks for your
> attempt to help me see the virtues of the current design.
>
> Cheers,
> Alan Isaac
>
>
>
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