[Numpy-discussion] identity

Scott Sinclair scott.sinclair.za@gmail....
Wed Aug 12 10:29:26 CDT 2009


>2009/8/12 Keith Goodman <kwgoodman@gmail.com>:
> On Wed, Aug 12, 2009 at 7:24 AM, Keith Goodman<kwgoodman@gmail.com> wrote:
>> On Wed, Aug 12, 2009 at 1:31 AM, Lars
>> Bittrich<lars.bittrich@googlemail.com> wrote:
>>>
>>> a colleague made me aware of a speed issue with numpy.identity. Since he was
>>> using numpy.diag(numpy.ones(N)) before, he expected identity to be at least as
>>> fast as diag. But that is not the case.
>>>
>>> We found that there was a discussion on the list (July, 20th; "My identity" by
>>> Keith Goodman). The presented solution was much faster. Someone wondered if
>>> the change was already made in the svn.
>>
>> Things tend to get lost on the mailing list. The next step would be to
>> file a ticket on the numpy trac. (I've never done that) That would
>> increase the chance of someone important taking a look at it.
>
> Here's the ticket:
>
> http://projects.scipy.org/numpy/ticket/1193
>

A patch against recent SVN trunk is attached to the ticket. Please review...

Cheers,
Scott


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