Wow. I thought I got the idea of what the entries in this table mean. But I couldn't tell where the x and y arguments would go in all cases. For example, I thought the 2 argument could go only into the >: verb and something like this cannot be done. (And thanks for the warning - I did need to kill J during experimentation of the phrase. LoL)
Thank you for sharing. > ... > These are explained well in https://www.jsoftware.com/help/learning/15.htm > Of course, feel free to use them if you like the challenge, but there > are far more important areas to get to know in J, like rank. Or all the > wonderful labs (in the menu, help > studio > labs). Thank you for the pointers. No, I'm not trying to look for a challenge. I'm drawn to J because I saw many of you can effortlessly change the execution & processing pipeline to solve problems from first principles using the language. I'm very interested in that. So, I'm more drawn to how to construct that pipeline than rank (more like controlling data slicing for a unit of processing). To understand J, it seems, one must build up the breadth and depth of J fundamentals sufficiently before a higher level concept (such as this table) can be effectively understood. I'll follow your advice and can come back to this later to see if my understanding improves over time. Thank you once again for the sharing and guidance. Bug report, this time on dissect: load 'debug/dissect' >: (^:^:_) (<&8) 2 8 dissect '>: (^:^:_) (<&8) 2' Syntax error: invalid sequence Conjunction Conjunction Error snippet: ^: ^: On Fri, Feb 17, 2023 at 1:02 AM Jan-Pieter Jacobs < janpieter.jac...@gmail.com> wrote: > Thanks David, > > That's certainly one to put in my toolbox. So nice (and common) I'd almost > expect it in the standard library. > Learned something new today :) > > Best regards, > Jan-Pieter > > On Thu, 16 Feb 2023, 18:28 David Lambert, <b49p23t...@gmail.com> wrote: > > > Of the new modifier trains, I've found ^:^:_ as "while". A simple test > > code: increment while less than 8. (With some errors one need kill the > > j session.) > > > > >: (^:^:_) (<&8) 2 > > > > 8 > > > > While=: ^:^:_ > > > > u. While v. > > u.^:v.^:_ > > > > > Date: Wed, 15 Feb 2023 13:12:37 +0100 > > > From: Jan-Pieter Jacobs<janpieter.jac...@gmail.com> > > > To:programm...@jsoftware.com > > > Subject: Re: [Jprogramming] Atop parsing > > > Message-ID: > > > < > > cans99cyu9dmv0kgq+sh4dtvxiueqvcoz_if5iwzw_cvuhh4...@mail.gmail.com> > > > Content-Type: text/plain; charset="UTF-8" > > > > > > The reason it's hard to find anything else on modifier trains is that > > they > > > have been removed from the language a long time ago (with j501 in 2002, > > > apparently), and only reintroduced recently with j903. > > > > > > Before the reintroduction, the only modifier trains were bidents: > > > - partially applied conjunctions, yielding adverbs; and > > > - chained adverbs, being applied to their left argument in order. > > > They were left over because they are simple, intuitive and easy to > > remember > > > (guessing here, as I wasn't around in the J scene yet). > > > These are explained well inhttps:// > > www.jsoftware.com/help/learning/15.htm . > > > The adverbs each and every defined in the standard library library are > > > useful examples of the first kind of bidents: > > > type&.<'each' > > > adverb > > > each > > > &.> > > > > > > The rabbit hole of general modifier trains is deep: they are not > > completely > > > intuitive (at least to me) and require a thorough understanding of the > > > parsing and execution in J, especially when chaining more than three. > > They > > > are also not indispensable, as you can write explicit conjunctions and > > > adverbs to do anything such tacit modifiers would do. I have yet to > find > > a > > > useful, non-trivial purpose for them... Of course, feel free to use > them > > if > > > you like the challenge, but there are far more important areas to get > to > > > know in J, like rank. Or all the wonderful labs (in the menu, help > > > studio > > >> labs). > > ---------------------------------------------------------------------- > > 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
