That is a different matter. Indeed, "=: works and is simple" as long as one is not concerned about producing (pure) tacit verbs. In that latter context, apparently, it does not work well, is not simple to use and its forced use might trigger gross space and time inefficiencies (for example, as discussed recently in the "[Jprogramming] Side effects in tacit expressions" thread).
Introducing new primitives is, in my view, a matter of perspective and opportunity. I thought the verbs =.. and =:: had sufficient merits and I had the means to include them in the version of the J interpreter that I use almost all the time (Jx). I just thought this could be an opportunity to make the official interpreter a little more tacit friendly for the benefit of other tacit programming hard-core fans; that is all. In any case, there are other much more important unfortunate omissions, in current official implementations, that drastically hinder tacit programming (but that is yet another topic for another time). On Thu, Jul 13, 2017 at 8:36 PM, Raul Miller <[email protected]> wrote: > Ok, but a routine being interesting is not sufficient motivation for > incorporating it as a language primitive. There are just too many > interesting possibilities. > > =: works and is simple. > > Thanks, > > -- > Raul > > On Thursday, July 13, 2017, Jose Mario Quintana < > [email protected]> wrote: > > > These [0, 1, 2, 3, 4, 5] are more forum instances of use or suggested use > > of the verb 4 :'(x)=: y' (or equivalent), > > > > [0] [Jprogramming] Tacit or Explicit Raul Miller > > http://www.jsoftware.com/pipermail/programming/2017- > > January/046538.html > > > > [1] [Jbeta] with effort for inplace assignment performance Raul Miller > > http://www.jsoftware.com/pipermail/beta/2016-July/008397.html > > > > [2] [Jprogramming] copula Raul Miller > > http://www.jsoftware.com/pipermail/programming/2014- > > November/040246.html > > > > [3] [Jbeta] Why isn't copula a dyadic verb? Pascal Jasmin > > http://www.jsoftware.com/pipermail/beta/2014-November/007754.html > > > > [4] [Jprogramming] copula Dan Bron > > http://www.jsoftware.com/pipermail/programming/2014-June/037704.html > > > > [5] Jforum: Syntax error on "is =: =:" josemarioquintana > > http://www.jsoftware.com/pipermail/general/2002-June/009932.html > > > > > > On Wed, Jul 12, 2017 at 8:11 PM, Jose Mario Quintana < > > [email protected] <javascript:;>> wrote: > > > > > Sure, there are different ways to perform a task, for example, > > > > > > 2&* 1 2 3 > > > 2 4 6 > > > +: 1 2 3 > > > 2 4 6 > > > > > > What do you mean by "the rest of that"? > > > > > > > > > On Wed, Jul 12, 2017 at 7:40 PM, Raul Miller <[email protected] > > <javascript:;>> > > > wrote: > > > > > >> All [1] needed was > > >> > > >> add=:4 :0 > > >> ((0{::y),'__x')=: ".1{::y > > >> ) > > >> > > >> But I don't really follow the rest of that. > > >> > > >> Thanks, > > >> > > >> -- > > >> Raul > > >> > > >> > > >> > > >> On Wed, Jul 12, 2017 at 7:14 PM, Jose Mario Quintana > > >> <[email protected] <javascript:;>> wrote: > > >> > The assignments are a consequence of J's agreement; see [0] for > > example. > > >> > If one wants the effect of 'a b c' =:i.3 4 5 using the verb is > (or > > a > > >> > similar verb) then one can use 'a b c' is i.3 4 5 :) > > >> > > > >> > How is 'abc' is"0 i.3 4 5 useful? I do not know... Who knows? > > >> > > > >> > How is the verb is (or a similar verb) useful? See [1, 2] for > > >> instance > > >> > (not to mention for debugging tacit verbs). > > >> > > > >> > References > > >> > > > >> > [0] Rank and Uniformity Roger K.W. Hui > > >> > http://www.jsoftware.com/papers/rank1.htm > > >> > > > >> > [1] [Jprogramming] Dynamic Language Features in J? Oleg Kobchenko > > >> > http://www.jsoftware.com/pipermail/programming/2006-Decembe > > >> r/004479.html > > >> > > > >> > [2] [Jprogramming] Saving Nouns as Permanent Data Jose Mario > Quintana > > >> > http://www.jsoftware.com/pipermail/programming/2008-April/ > > >> 010529.html > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > On Wed, Jul 12, 2017 at 4:00 PM, Don Kelly <[email protected] > > <javascript:;>> wrote: > > >> > > > >> >> How is "is" more useful than from x=: y > > >> >> > > >> >> what is interesting is that > > >> >> > > >> >> 'abc' is "0 i.3 4 5 displays the i.3 4 5 array but the value of abc > > >> >> appears as : although a, b, c correspond to > > >> >> > > >> >> (<0 1 2; 3; 4){i. 3 4 5 > > >> >> > > >> >> 19 39 59 > > >> >> > > >> >> > > >> >> In the use of "is" in this case it appears that it > > >> >> > > >> >> > > >> >> whereas 'abc' =: i. 3 4 5 gives stores the noun abc as the array > but > > >> >> leaves a, b and c undefined > > >> >> > > >> >> and 'a b c' =:i.3 4 5 gives 3 (4 by 5 )arrays > > >> >> > > >> >> > > >> >> Don Kelly > > >> >> > > >> >> > > >> >> > > >> >> On 2017-07-12 11:08 AM, Jose Mario Quintana wrote: > > >> >> > > >> >>> Maybe I am misunderstanding... Are you trying to imply that one > > >> cannot > > >> >>> find a verb such as is=: 4 :'(x)=:y' useful? > > >> >>> > > >> >>> > > >> >>> On Tue, Jul 11, 2017 at 8:37 PM, Raul Miller < > [email protected] > > <javascript:;>> > > >> >>> wrote: > > >> >>> > > >> >>> Ok, so, just to be clear - this has nothing to do with default > > >> assignment? > > >> >>>> > > >> >>>> That said, it's probably intentional that there's no verb form of > > =: > > >> >>>> (or =.). For example, given > > >> >>>> > > >> >>>> is=: 4 :'(x)=:y' > > >> >>>> > > >> >>>> consider: > > >> >>>> > > >> >>>> 'abc' is"0 i.3 4 5 > > >> >>>> > > >> >>>> Questions: > > >> >>>> > > >> >>>> (1) what is > > >> >>>> > > >> >>>> a+b+c > > >> >>>> > > >> >>>> (2) how is this useful? > > >> >>>> > > >> >>>> Thanks, > > >> >>>> > > >> >>>> -- > > >> >>>> Raul > > >> >>>> > > >> >>>> > > >> >>>> On Tue, Jul 11, 2017 at 12:53 PM, 'Pascal Jasmin' via Programming > > >> >>>> <[email protected] <javascript:;>> wrote: > > >> >>>> > > >> >>>>> Don't fixate on just Henry's syntax or default values. > > >> >>>>> > > >> >>>>> The basic "delegated function assignment" is: > > >> >>>>> > > >> >>>>> assign =: 4 : '(x) =: y' > > >> >>>>> > > >> >>>>> its a verb, that can be composed with others (or rewritten for a > > >> >>>>> > > >> >>>> different/enhanced delegated assignment function) in a wide > variety > > >> of > > >> >>>> ways > > >> >>>> that include all of the discussed applications in this thread. > > >> >>>> > > >> >>>>> problem 1: can only use =: not =. > > >> >>>>> > > >> >>>>> problem 2: performance issue in any "delegated function > > assignment" > > >> >>>>> > > >> >>>> that wouldn't (or might not) exist if there were verb (and adverb > > >> forms I > > >> >>>> proposed) forms of copula. > > >> >>>> > > >> >>>>> I've just repeated previous statements entirely here. Perhaps > the > > >> >>>>> > > >> >>>> mistake I made was not providing an ideal example to your first > > >> request. > > >> >>>> > > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
