Removing the empty cells: a#~-.(<'')=a=.,(>:i.5)<\'abcde'
│a│b│c│d│e│ab│bc│cd│de│abc│bcd│cde│abcd│bcde│abcde│ I'm sure this can be reduced by J experts in implicit coding. Skip On Thu, Oct 24, 2019 at 12:23 PM Jimmy Gauvin <[email protected]> wrote: > 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
