[Numpy-discussion] Would a patch with a function for incrementing an array with advanced indexing be accepted?

Frédéric Bastien nouiz@nouiz....
Fri Jun 29 13:43:09 CDT 2012


Hi,

I personnaly can't review this as this is too much in NumPy internal.

My only comments is that you could add a test and an example in the
doc for matrix[list]. I think it will be the most used case.

Fred

On Wed, Jun 27, 2012 at 7:47 PM, John Salvatier
<jsalvati@u.washington.edu> wrote:
> I've submitted a pull request ( https://github.com/numpy/numpy/pull/326 ).
> I'm new to the numpy and python internals, so feedback is greatly
> appreciated.
>
>
> On Tue, Jun 26, 2012 at 12:10 PM, Travis Oliphant <travis@continuum.io>
> wrote:
>>
>>
>> On Jun 26, 2012, at 1:34 PM, Frédéric Bastien wrote:
>>
>> > Hi,
>> >
>> > I think he was referring that making NUMPY_ARRAY_OBJECT[...] syntax
>> > support the operation that you said is hard. But having a separate
>> > function do it is less complicated as you said.
>>
>> Yes. That's precisely what I meant.   Thank you for clarifying.
>>
>> -Travis
>>
>> >
>> > Fred
>> >
>> > On Tue, Jun 26, 2012 at 1:27 PM, John Salvatier
>> > <jsalvati@u.washington.edu> wrote:
>> >> Can you clarify why it would be super hard? I just reused the code for
>> >> advanced indexing (a modification of PyArray_SetMap). Am I missing
>> >> something
>> >> crucial?
>> >>
>> >>
>> >>
>> >> On Tue, Jun 26, 2012 at 9:57 AM, Travis Oliphant <travis@continuum.io>
>> >> wrote:
>> >>>
>> >>>
>> >>> On Jun 26, 2012, at 11:46 AM, John Salvatier wrote:
>> >>>
>> >>> Hello,
>> >>>
>> >>> If you increment an array using advanced indexing and have repeated
>> >>> indexes, the array doesn't get repeatedly
>> >>> incremented,
>> >>> http://comments.gmane.org/gmane.comp.python.numeric.general/50291.
>> >>> I wrote a C function that does incrementing with repeated indexes
>> >>> correctly.
>> >>> The branch is here (https://github.com/jsalvatier/numpy see the last
>> >>> two
>> >>> commits). Would a patch with a cleaned up version of a function like
>> >>> this be
>> >>> accepted into numpy? I'm not experienced writing numpy C code so I'm
>> >>> sure it
>> >>> still needs improvement.
>> >>>
>> >>>
>> >>> This is great.   It is an often-requested feature.   It's *very
>> >>> difficult*
>> >>> to do without changing fundamentally what NumPy is.  But, yes this
>> >>> would be
>> >>> a great pull request.
>> >>>
>> >>> Thanks,
>> >>>
>> >>> -Travis
>> >>>
>> >>>
>> >>>
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>> >>
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