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]> 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]>
> 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]> 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]> 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]>
>> >>> 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]> 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.
>> >>>>
>> >>>>> ________________________________
>> >>>>> From: Raul Miller <[email protected]>
>> >>>>> To: Programming forum <[email protected]>
>> >>>>> Sent: Tuesday, July 11, 2017 12:37 PM
>> >>>>> Subject: Re: [Jprogramming] Request for comments: multiple
>> assignment
>> >>>>>
>> >>>>>
>> >>>>>
>> >>>>> I do not see yet that it would be even possible to do that in a way
>> >>>>> that takes advantage of in place assignment optimization. The
>> default
>> >>>>> mechanism only kicks in when no value was being assigned, and it
>> seems
>> >>>>> to me that cases where you can meaningly have "no value was being
>> >>>>> assigned so we need a default" already have complexity which defeats
>> >>>>> the in place assignment optimization.
>> >>>>>
>> >>>>> Worse, though, is that this does not seem like a common case (which
>> >>>>> suggests that it's best not to optimize for it).
>> >>>>>
>> >>>>> That said, if we're not going to be dealing with code examples (and
>> I
>> >>>>> certainly cannot think of any - the requirements seem
>> contradictory),
>> >>>>> and we are going to continue discussing this, perhaps we should move
>> >>>>> to the chat forum?
>> >>>>>
>> >>>>> That said, here's a hypothetical non-example based on Henry's
>> initial
>> >>>>>
>> >>>> post:
>> >>>>
>> >>>>> 'L(0)'=: L,y
>> >>>>>
>> >>>>> For that default value (0) to be relevant, the expression (L,y) must
>> >>>>> be undefined. But if y were undefined the statement would fail with
>> an
>> >>>>> error. And if y were defined and the statement does not fail with an
>> >>>>> error, then that default of (0) can never be used.
>> >>>>>
>> >>>>> Which takes me back to my previous thought which was that taking
>> >>>>> advantage of in place optimizations for this default seems
>> impossible.
>> >>>>>
>> >>>>> So... once again... what are you talking about?
>> >>>>>
>> >>>>> Thanks,
>> >>>>>
>> >>>>> --
>> >>>>> Raul
>> >>>>>
>> >>>>>
>> >>>>>
>> > ----------------------------------------------------------------------
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>> ----------------------------------------------------------------------
>> For information about J forums see http://www.jsoftware.com/forums.htm
>>
>
>
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