Re: [Bug-apl] Supporting negative ranks for ⍤ operator

[Alexey Veretennikov]

Actually Dyalog returns the same result.

Elias Mårtenson <address@hidden> writes:

> In GNU APL, the following two expressions yield the same result:
>
> (+/⍤1) 3 4⍴⍳100
> ┏→━━━━━━━┓
> ┃10 26 42┃
> ┗━━━━━━━━┛
>
> And:
>
> (+/⍤¯1) 3 4⍴⍳100
> ┏→━━━━━━━┓
> ┃10 26 42┃
> ┗━━━━━━━━┛
>
> I would expect the latter to yield the following (which is what I believe 
> Dyalog does):
>
> ┏→━━━━━━━━━━┓
> ┃15 18 21 24┃
> ┗━━━━━━━━━━━┛
>
> Regards,
> Elias
>
> On 6 May 2016 at 21:22, Jay Foad <address@hidden> wrote:
>
>
>  On 6 May 2016 at 13:52, Juergen Sauermann <address@hidden> wrote:
>  > Except maybe for the Dyalog ¯1 case (primarily because I don't know what
>  > "major cells" are).
>
>  Dyalog treats ¯1 the same as the ISO standard (and therefore also GNU
>  APL). "Major cell" is explained on page 14 of:
>  http://docs.dyalog.com/14.1/Dyalog%20APL%20Programmer's%20Guide.pdf
>
>  Jay.
>
>
>

-- 
Br,
/Alexey