Re the question: "why is J not as popular as it ought to be" I provide J solutions to various problems on Quora <https://www.quora.com/>, mainly to improve my J programming skills. I have solved thousands of Quora problems over the last 8 years. Many of my solutions have tens of thousands of views, and dozens of upvotes. I occasionally get comments asking about J, both positive & negative. The responses range from "I need to know more" to "Too complex/terse". The most common response is "I never knew about J" or the equivalent. So it sounds like J needs a promo campaign.
I sporadically put the following text at the end of each of my J solutions on Quora: <<<>>> “Civilization advances by extending the number of important operations which we can perform without thinking of them.” ― Alfred North Whitehead https://www.jsoftware.com/ J Promo Video: https://www.youtube.com/watch?v=aV936cVrN0I J Playground: https://jsoftware.github.io/j-playground/bin/html/emj.html <https://jsoftware.github.io/j-playground/bin/html/emj.html> J Docs Pages: https://code2.jsoftware.com/mediawiki/index.php/Main_Page New J Math: https://code.jsoftware.com/wiki/The_New_J_Math#beg <<<>>> Skip Cave Cave Consulting LLC On Thu, Sep 7, 2023 at 4:09 PM Piet de Jong <pietd...@gmail.com> wrote: > Thanks for all the great suggestions which has helped me a lot. > > To my mind it does raise a couple of issues or questions. > > I’ll stick my head out with them, knowing there might be much blowback. > But bear with me. > > Slicing is a pretty intuitive concept so why should it be so intricate and > “hard"? > > Maybe this is one of the reasons why J is not as popular as it ought to be. > > I “love” J and always use it. > > But I have not been able to convince a single other person to take it up. > > I’m always wondering why? Does it mean it’s just too intricate for the > average Joe. > Most people on this forum I imagine love the intricacy and see it as an > enjoyable challenge. > > But the average Joe just wants to solve problems as quickly as possible > and get on with life, not waste time on challenging intricate puzzles. > > So perhaps J is too much “puzzle solving” rather than “problem solving” > > Notwithstanding the above — I’ll always stick with J. > > > > On 8 Sep 2023, at 04:22, Jose Mario Quintana < > jose.mario.quint...@gmail.com> wrote: > > > > Oops, I forgot o=. @: > > > > On Thu, Sep 7, 2023 at 1:27 PM Jose Mario Quintana < > > jose.mario.quint...@gmail.com> wrote: > > > >>> The order of the last two appear "unnatural". (To my way of thinking > at > >> least) > >>> This seems to beg the question what is the natural order when slicing. > >> > >> The answer might depend on the intended usage of the verb that you have > in > >> mind. If, for example, > >> you want to preserve the order of the remaining axes, then Henry's > >> suggestion modified by Raul would work, > >> > >> $ Y=. i.2 3 4 5 > >> 2 3 4 5 > >> > >> slicep=. ~.@(, i.@#@$) |: ] > >> > >> (0 1 2 3) ($ o slicep"0 _) Y > >> 2 3 4 5 > >> 3 2 4 5 > >> 4 2 3 5 > >> 5 2 3 4 > >> > >> Another possibility is to rotate the axes, > >> > >> slicer=. (|. i.@:#@:$@:]) |: ] > >> > >> (0 1 2 3) ($ o slicer"0 _) Y > >> 2 3 4 5 > >> 3 4 5 2 > >> 4 5 2 3 > >> 5 2 3 4 > >> > >> I hope this helps > >> > >> > >> On Wed, Sep 6, 2023 at 7:58 PM Piet de Jong <pietd...@gmail.com> wrote: > >>> > >>> This works! > >>> Except the ordering of the axes is slightly unusual to my way of > >> thinking. > >>> For example suppose m=.i.3 3 3 is the “cube" be sliced and v is your > >> verb. > >>> Then the items of (0 v m) has successive items “going back” into the > >> cube. > >>> The items (1 v m) are the horizontal slices. > >>> The items of (2 v m) are the vertical slices. > >>> > >>> The order of the last two appear "unnatural". (To my way of thinking > at > >> least) > >>> This seems to beg the question what is the natural order when slicing. > >>> > >>>> On 7 Sep 2023, at 08:32, Henry Rich <henryhr...@gmail.com> wrote: > >>>> > >>>> Since you want all the slices, what you are looking for is a > transpose. > >>>> > >>>> Maybe > >>>> > >>>> ~.@(, i.@#) |: ] > >>>> > >>>> Untested. > >>>> > >>>> Henry Rich > >>>> > >>>> On Wed, Sep 6, 2023, 6:10 PM Piet de Jong <pietd...@gmail.com> wrote: > >>>> > >>>>> Here is my “wish" > >>>>> > >>>>> A dyadic (tacit) verb such that x v y gives all the slices of y along > >>>>> dimension x, where x is integer. That is to say > >>>>> > >>>>> i{ x v y > >>>>> > >>>>> is slice i of the array y along dimension x. > >>>>> > >>>>> Thanks for all your help! > >>>>> > >>>>>> On 7 Sep 2023, at 08:04, 'robert therriault' via Programming < > >>>>> programm...@jsoftware.com> wrote: > >>>>>> > >>>>>> Or something like this? > >>>>>> > >>>>>> [n =. i. 2 2 2 > >>>>>> 0 1 > >>>>>> 2 3 > >>>>>> > >>>>>> 4 5 > >>>>>> 6 7 > >>>>>> ,./ n > >>>>>> 0 1 4 5 > >>>>>> 2 3 6 7 > >>>>>> ($ $ (,@,./)) n > >>>>>> 0 1 > >>>>>> 4 5 > >>>>>> > >>>>>> 2 3 > >>>>>> 6 7 > >>>>>> > >>>>>> Cheers, bob > >>>>>> > >>>>>> > >>>>>>> On Sep 6, 2023, at 14:49, 'robert therriault' via Programming < > >>>>> programm...@jsoftware.com> wrote: > >>>>>>> > >>>>>>> Hi Piet, > >>>>>>> > >>>>>>> Maybe show us what you would want to do with higher dimensions? Or > a > >>>>> less symmetric 2 dimensional shape? > >>>>>>> > >>>>>>> For shape 2 2, I would use the even simpler > >>>>>>> > >>>>>>> |: m > >>>>>>> 0 2 > >>>>>>> 1 3 > >>>>>>> > >>>>>>> Hope this helps. > >>>>>>> > >>>>>>> Cheers, bob > >>>>>>> > >>>>>>>> On Sep 6, 2023, at 14:26, Brian Schott <schott.br...@gmail.com> > >> wrote: > >>>>>>>> > >>>>>>>> ,./0 1 {"1 m > >>>>>>> > >>>>>>> > >> ---------------------------------------------------------------------- > >>>>>>> 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 > >>> > >>> ---------------------------------------------------------------------- > >>> 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
