I considered the possibility that "filtering columns" would mean "discarding some columns" but that didn't make sense to me.
So, instead, I decided it meant "filtering values from columns". In other words, picking example data from one column to represent classes of data labeled in another column. I hope this makes sense, -- Raul On Tue, Oct 12, 2021 at 12:22 PM Michal Wallace <[email protected]> wrote: > > Lol. Thanks for the feedback, everyone. > > These "shorts" show up for people flipping through video after video on > their phones, > completely out of context, and the advice I keep hearing is to make them > really fast > paced and visually interesting to maintain retention. > > Replacing my talking head with a text transcription might make sense for > watching in > a noisy environment. Or maybe just use fewer lines with more comments > on-screen. > > @Joe: I guess that particular example is kind of silly, but the idea would > be something like having > a table of all the eleven-letter english words, one character per row, one > column per word. then: > > select nearsighted_letters from eleven_letter_words where > nub_sieve(mississippi_letters)=1; > > I was originally going to use (~: V) # 'MISSISSIPPI' (which would give > 'MISP') but > that seemed like it would be confusing in a different way. Oh well. :/ > > > > On Tue, Oct 12, 2021 at 12:01 PM Joe Bogner <[email protected]> wrote: > > > I enjoyed it and was good with the speed / pace up until 43 seconds where > > you talked about 'It comes in really handy when you're using one list to > > select from others, like filtering columns in a database' > > > > I still can't wrap my head around how the code example below connects with > > filtering columns in a database. Maybe the voice-track at that point wasn't > > meant to match the code on the screen? > > > > V i. V =: 'Mississippi' > > 0 1 2 2 1 2 2 1 8 8 1 > > (~: V) # 'nearsighted' > > neat > > > > Other than that it was a very worthwhile 58 seconds of my life :) (I've > > watched it several times at this point including on slow-mo so probably 10 > > minutes at least). Thanks for sharing! > > > > On Mon, Oct 11, 2021 at 10:25 AM Michal Wallace <[email protected]> > > wrote: > > > > > I made a 58-second J "Youtube Short" (AKA lightning talk): > > > > > > https://www.youtube.com/shorts/eZPDSl4H2hA > > > > > > It's the movie edition of a comment I made on the J Wiki a while back. :D > > > > > > I'm especially proud of this one because all the REPL interaction was > > > recorded with jprez (the presentation tool I've been working on)! > > > ---------------------------------------------------------------------- > > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
