[ncl-talk] Feature request: Negative indexes

[Dennis Shea]

 NCL-2436 - Negative index values <https://jira.ucar.edu/browse/NCL-2436>

A JIRA ticket has been opened.

On Tue, May 10, 2016 at 8:53 PM, Kyle Griffin <ksgriffin2 at wisc.edu> wrote:

> Given someone who often finds himself in shoes similar to Alan's, at least
> with regard to python, the syntax of x(-1) often slips through my
> fingertips in NCL as well.
>
> I also can't think of any immediate downsides, as I believe there is no
> acceptable or legal use of negative non-coordinate indices in NCL
> currently, and I would think no reasonably constructed code would be
> 'dependent' on errors thrown by attempting to use such indices.
>
> Lastly, there are a number of times in which I've used syntax such as
> x(0:dimsizes(x)-2), which, perhaps unintuitively, reads all but the last 1
> item.
>
> Just consider this another vote in favor, pending any future discovery of
> downsides.
>
> Thanks for considering...
>
>
> Kyle
>
> On Tue, May 10, 2016 at 7:17 PM David Brown <dbrown at ucar.edu> wrote:
>
>> I agree that negative indexes would be great and we don't know what
>> the downsides are either, although we would probably find out if we
>> tried to implement them.
>>  -dave
>>
>> On Tue, May 10, 2016 at 2:41 PM, Alan Brammer <abrammer at albany.edu>
>> wrote:
>> > Not sure if this has been brought up before but I’d really like the
>> ability to fetch the last index of an array using x(-1), or similarly the
>> last n of the array x(-n:)
>> >
>> > Being in a mostly javascript/python world outside of NCL negative
>> indexes have been quite useful.
>> >
>> > Any plans or possibility of this becoming a thing, or are there
>> downsides I’m not thinking of?
>> >
>> > Thanks,
>> >
>> > Alan
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