Elegance is in the eye of the beholder.
;(>:i.5) (|.@[ <@{."0 1 <\) 'abcde'
┌─┬─┬─┬─┬─┬──┬──┬──┬──┬───┬───┬───┬────┬────┬─────┐
│a│b│c│d│e│ab│bc│cd│de│abc│bcd│cde│abcd│bcde│abcde│
└─┴─┴─┴─┴─┴──┴──┴──┴──┴───┴───┴───┴────┴────┴─────┘
R.E. Boss
> -----Oorspronkelijk bericht-----
> Van: Programming <programming-boun...@forums.jsoftware.com>
> Namens Jimmy Gauvin
> Verzonden: donderdag 24 oktober 2019 19:24
> Aan: programm...@jsoftware.com
> Onderwerp: [Jprogramming] Consecutive substrings (was Quora problem)
>
> Hi,
>
> I was wondering if there was some way to emulate R.E.Boss's elegant code
> to generate all the substrings of consecutive elements of a vector :
>
> <@(<\.)\'abcde'
> ┌───┬──────┬──────────┬───────────────┬──────────────────
> ───┐
> │┌─┐│┌──┬─┐│┌───┬──┬─┐│┌────┬───┬──┬─┐│┌─────┬────┬───┬
> ──┬─┐│
> ││a│││ab│b│││abc│bc│c│││abcd│bcd│cd│d│││abcde│bcde│cde│de│e││
> │└─┘│└──┴─┘│└───┴──┴─┘│└────┴───┴──┴─┘│└─────┴────┴───┴
> ──┴─┘│
> └───┴──────┴──────────┴───────────────┴──────────────────
> ───┘
> ;<@(<\.)\'abcde'
> ┌─┬──┬─┬───┬──┬─┬────┬───┬──┬─┬─────┬────┬───┬──┬─┐
> │a│ab│b│abc│bc│c│abcd│bcd│cd│d│abcde│bcde│cde│de│e│
> └─┴──┴─┴───┴──┴─┴────┴───┴──┴─┴─────┴────┴───┴──┴─┘
>
> Using infix with all the substring lengths almost gets us there but there are
> a
> lot of empty cells :
> , (>:i.5) <\'abcde'
> ┌─┬─┬─┬─┬─┬──┬──┬──┬──┬┬───┬───┬───┬┬┬────┬────┬┬┬┬
> ─────┬┬┬┬┐
> │a│b│c│d│e│ab│bc│cd│de││abc│bcd│cde│││abcd│bcde││││abcde│││││
> └─┴─┴─┴─┴─┴──┴──┴──┴──┴┴───┴───┴───┴┴┴────┴────┴┴┴┴
> ─────┴┴┴┴┘
>
> Is there an elegant way of eliminating the empty cells ?
>
> Thanks,
>
> Jimmy
>
> PS Adding oblique and transpose gives the same order as R.E.Boss's
> expression :
> ; <@, /. |: (>:i.5) <\'abcde'
> ┌─┬──┬─┬───┬──┬─┬────┬───┬──┬─┬─────┬────┬───┬──┬─┬┬
> ┬┬┬┬┬┬┬┬┐
> │a│ab│b│abc│bc│c│abcd│bcd│cd│d│abcde│bcde│cde│de│e│││││││││││
> └─┴──┴─┴───┴──┴─┴────┴───┴──┴─┴─────┴────┴───┴──┴─┴┴
> ┴┴┴┴┴┴┴┴┘
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
