timespacex --not in j602. Nor timer nor timex.

On Fri, Jul 11, 2014 at 2:24 AM, Ric Sherlock <[email protected]> wrote:

> Just a note that (6!:2 , 7!:2@]) is defined as timespacex in the stdlib,
> so
> not necessary to redefine if you don't want to.
>     timespacex
>
> 6!:2 , 7!:2@]
>
>
>
>
>
> On Fri, Jul 11, 2014 at 11:16 AM, Ian Clark <[email protected]> wrote:
>
> > Hear-hear, Dan.
> >
> > To which I would only add: consider testing alternatives using ts
> > (time/space) like this. Test the exact phrase you plan to use. The
> results
> > can be not what you expect:
> >
> >    ts =: 6!:2 , 7!:2@]
> >    y =: i.10000
> >    k =: 2
> >
> >    ts '0 k} y'
> > 4.88281e_6 66432
> >    ts 'y * (y~:k)'
> > 2.50244e_5 82624
> >    ts 'y=: y * (y~:k)'
> > 2.62451e_5 82752
> >    ts 'y=: 0 k} y'      NB. a "special combination"
> > 3.05176e_6 896
> >
> > But if time and space are of no concern to you (e.g. because your data
> are
> > small enough) then does it really matter what you do if it works?
> >
> >
> > On Thu, Jul 10, 2014 at 4:36 PM, Dan Bron <[email protected]> wrote:
> >
> > > Ben Gorte wrote:
> > > >  Better than the "code smell" of using amend, according to the
> previous
> > > discussion
> > >
> > > I'd say that given your use case, amend is the right way to go.  You
> > have a
> > > list of indices and a list of values; creating arrays from those inputs
> > is
> > > the very definition and purpose of Amend.
> > >
> > > In general, using Amend to construct an array for the first time seems
> > fine
> > > to me.  What I'd be more wary of is if you notice yourself using for
> > > intermediate transformations - particularly if the changes (the uses of
> > })
> > > are both frequent and small, because that's indicative of the "scalar
> > > language" way of thinking.
> > >
> > > I'd further say that if you're confident in your use of J and
> > > array-oriented programming, there's no particular reason to *avoid*
> > amend.
> > >  I think you'll just naturally find yourself using it less.  But in the
> > > cases where it's the right tool for the job - well, then, it's the
> right
> > > tool for the job.  I'd use it with no more compunction than I'd have
> > about
> > > # or /. or + or whatever. (But that's because I'm an egomaniac, and I'm
> > > pretty sure of my ability to discriminate the situations } is the right
> > > tool for the job, and when I'm using it as a crutch.)
> > >
> > > -Dan
> > >
> > > ----- Original Message ---------------
> > >
> > > Subject: Re: [Jprogramming] Tacit J and indexed replacement
> > >    From: Ben Gorte - CITG <[email protected]>
> > >    Date: Thu, 10 Jul 2014 14:43:01 +0000
> > >      To: "[email protected]" <[email protected]>
> > >
> > >
> > >
> > > > Better how? Time? Space? Compactness?
> > >
> > > Better than the "code smell" of using amend, according to the previous
> > > discussion
> > >
> > >
> > >
> > > On 7/10/14, Ben Gorte - CITG <[email protected]> wrote:
> > > > I am often in situations where I want to put a lot of (image)
> > > measurements
> > > > in a grid. I know what values I have to put at which positions, but I
> > do
> > > not
> > > > have the entire set (sensor malfunctioning).
> > > >
> > > > This simulates it. From
> > > >    M =: ?1000 1000$5
> > > > my sensor takes:
> > > >    i=.4$.$.M
> > > >    v=.5$.$.M
> > > >    $i
> > > > 800076 2
> > > >
> > > > So I have 800076 values v and indexes i, which I want to put in a
> 1000
> > by
> > > > 1000 grid, filling up de holes with 0-s:
> > > >
> > > >    N =:  v (;/i) } 1000 1000$0
> > > >
> > > > And of course:
> > > >    N -: M
> > > > 1
> > > >
> > > > Is there a better way to do this?
> > > >
> > > > Ben
> > > > ___________________________
> > > > From: [email protected]
> > > > [[email protected]] on behalf of Dan Bron
> > > > [[email protected]]
> > > > Sent: Tuesday, July 08, 2014 02:23
> > > > To: [email protected]
> > > > Subject: Re: [Jprogramming] Tacit J and indexed replacement
> > > >
> > > > Do you have examples, in practice, where you've wanted to modify one
> > item
> > > > (or a sublist) from a data structure?
> > > >
> > > > Would you say those circumstances are the exception or the rule? (I'm
> > > asking
> > > > because it's definitely the exception in my own experience, and more
> > > often
> > > > than not a "code smell").
> > > >
> > > > -Dan
> > > >
> > > > Please excuse typos; sent from a phone.
> > > >
> > > >> On Jul 7, 2014, at 8:14 PM, "'Pascal Jasmin' via Programming"
> > > >> <[email protected]> wrote:
> > > >>
> > > >> I think } (dyadic amend) is pretty essential.  The obvious use is
> > > amending
> > > >> one (or sublist) item from a data structure.
> > > >>
> > > >> Item amend maybe a little more esoteric, but I find it easy to
> > > >> conceptualize, and use the "verbified" form 4 : 'x}y' as a "natural"
> > way
> > > >> of implementing the example in this thread.
> > > >>
> > > >>
> > > >> ----- Original Message -----
> > > >> From: Dan Bron <[email protected]>
> > > >> To: [email protected]
> > > >> Cc:
> > > >> Sent: Monday, July 7, 2014 7:42:35 PM
> > > >> Subject: Re: [Jprogramming] Tacit J and indexed replacement
> > > >>
> > > >> Pepe, I'm with Ian and Henry on this one: questions of efficiency
> > aside,
> > > >> I
> > > >> rarely find a call for  }  .  The only place I really use it is in
> the
> > > >> expression  ('A'&=)`(,:&'B') }  to make scalar substitutions.  So
> I'm
> > > >> interested in where you find uses for it.
> > > >>
> > > >> Do you have specific examples?  Would you say you reach for  }  when
> > > >> efficiency is a concern, even if the thought could be expressed more
> > > >> conveniently using some other tool, or that you've found places
> where
> >  }
> > > >> is the best way to say what you want to say?  If the latter (} is
> the
> > > >> word
> > > >> you want), are there any particular characteristics that tie those
> use
> > > >> cases together?
> > > >>
> > > >> I personally find (bearing in mind that I'm a J hobbyist, and [no
> > > longer]
> > > >> a
> > > >> professional) that I mostly think in terms of items, and modifying
> > > >> anything below the level of an item would be quite unusual in my
> code,
> > > >> and
> > > >> make me suspicious.  Similarly, I almost always treat all items
> > > >> identically, and a consistent need to treat just some items
> specially
> > > >> would make me suspicious, and I'd wonder whether I should be
> > structuring
> > > >> my data differently.
> > > >>
> > > >> With that said, I certainly (especially in my "professional J-ing"
> > days)
> > > >> see the benefit of  }  for performance.  But I'm wondering if you've
> > > >> invented or discovered generally beneficial uses of  }  unrelated to
> > > >> performance.  I'd be very interested in that, if so ('cause the only
> > one
> > > >> I
> > > >> ever invented or discovered was, as I said, scalar substitution).
> > > >>
> > > >> -Dan
> > > >>
> > > >> ----- Original Message ---------------
> > > >>
> > > >> Subject: Re: [Jprogramming] Tacit J and indexed replacement
> > > >>   From: Jose Mario Quintana <[email protected]>
> > > >>   Date: Mon, 7 Jul 2014 19:12:55 -0400
> > > >>     To: Programming forum <[email protected]>
> > > >>
> > > >> Ian wrote:
> > > >> "
> > > >> And the reason for that has less to do with finding it "hard to get
> my
> > > >> head
> > > >> round Amend" than the fact that "in-place array modification" is a
> > > >> technique that goes hand-in-hand with a scalar approach to
> > > >> problem-solving,
> > > >> which is not what J is designed to do well.
> > > >> "
> > > >>
> > > >> How come?  In the form  (x m} y), x, y and m are all allowed to be
> > > >> arrays,
> > > >> are they not?
> > > >>
> > > >> Ian wrote:
> > > >> "
> > > >> I still
> > > >> stand firmly by what Henry and I wrote in the NuVoc page on Amend:
> > > >>
> > > >> x m} y is used in J much less than you would think, considering the
> > > >> importance of in-place array modification in other languages.
> > > >> "
> > > >>
> > > >> I also stand firm by what I wrote (no offense):
> > > >>
> > > >> "I find the forms <@:v N} ] and v N} ] extremelly useful for writing
> > > >> tacitly."
> > > >>
> > > >> That is, when the task at hand goes beyond to dealing with one or
> two
> > > >> (tacit) arguments and joggling intermediate results with forks or
> > alike
> > > >> (and the tacit sentence (paragraph, chapter, section, book,...) is
> > meant
> > > >> to
> > > >> be efficient).
> > > >>
> > > >> :)
> > > >>
> > > >> Actually, I think, both statements (yours and mine) can stand
> because
> > > few
> > > >> J
> > > >> users are willing to go that far tacitly.
> > > >>
> > > >>
> > > >>
> > > >>> On Mon, Jul 7, 2014 at 3:22 AM, Ian Clark <[email protected]>
> > > wrote:
> > > >>>
> > > >>> Thanks, guys, keep the ideas coming. There's enough been said in
> this
> > > >>> thread to enable me to substantially improve the NuVoc presentation
> > of
> > > >>> Amend in http://www.jsoftware.com/jwiki/Vocabulary/curlyrt#dyadic
> -
> > > >>> which
> > > >>> I
> > > >>> think most would agree doesn't present Amend in the most appealing
> > > >>> light.
> > > >>> Perhaps unfairly so.
> > > >>>
> > > >>> In particular, I like Aai's idea:
> > > >>>
> > > >>> zero =: 0:`[`]}
> > > >>>    3 5 zero i.9
> > > >>> 0 1 2 0 4 0 6 7 8
> > > >>>
> > > >>> (BTW I realize this not the form he delivered it in)
> > > >>>
> > > >>> which I think ought to replace the present cumbersome NuVoc
> example.
> > > >>>
> > > >>> Raul asks, as usual, "what am I trying to do?" Adopting the role of
> > a J
> > > >>> novice, I have to reply "learn J of course" - by the expedient of
> > > >>> learning
> > > >>> the utility and usage of J's primitives, viewed as a toolkit. But
> if
> > I
> > > >>> come
> > > >>> clean about my own personal motives, it's to write a good NuVoc
> page
> > > >>> which
> > > >>> helps a complete J novice understand Amend and what it's good for -
> > if
> > > >>> anything.
> > > >>>
> > > >>> I reject the insinuation that I use Amend less than I might because
> > I'm
> > > >>> not
> > > >>> smart enough. A J novice, experienced in another language, would
> feel
> > > >>> patronized by such a suggestion. Moreover she would find it hard to
> > > >>> resist
> > > >>> the impression that J-jocks were covering up for a grave defect in
> > the
> > > >>> language. And I was lying when I said I didn't have much use for
> > Amend.
> > > >>> But
> > > >>> I wanted to play devil's advocate in support of Erling's criticism,
> > > >>> because
> > > >>> I believe he speaks for most newcomers trained on a "scalar"
> language
> > > >>> like
> > > >>> C.
> > > >>>
> > > >>> For all the splendid, creative ways of force-feeding Amend into
> > > >>> submission
> > > >>> I've seen in this thread (e.g. by using a gerund for operand "m") I
> > > >>> still
> > > >>> stand firmly by what Henry and I wrote in the NuVoc page on Amend:
> > > >>>
> > > >>> x m} y is used in J much less than you would think, considering the
> > > >>> importance of in-place array modification in other languages.
> > > >>>
> > > >>> And the reason for that has less to do with finding it "hard to get
> > my
> > > >>> head
> > > >>> round Amend" than the fact that "in-place array modification" is a
> > > >>> technique that goes hand-in-hand with a scalar approach to
> > > >>> problem-solving,
> > > >>> which is not what J is designed to do well. So Raul's question
> "what
> > am
> > > >>> I
> > > >>> trying to do?" turns out to be appropriate after all, when it comes
> > to
> > > >>> using Amend. Or using something else - like (*) or (#) with a
> Boolean
> > > >>> list.
> > > >>>
> > > >>>
> > > >>>> On Mon, Jul 7, 2014 at 4:58 AM, Raul Miller <
> [email protected]>
> > > >>>> wrote:
> > > >>>>
> > > >>>> Since it'w nagging at me (and this is still unteted code :/),
> here's
> > > >>>> what I currently think i should have said:
> > > >>>>    amend=: (0:{::])`(1:{::])`(2:{::])}~
> > > >>>>
> > > >>>> The trailing ~ because I need the dyad from the resulting verb,
> and
> > > >>>> the trailing ] on each because those verbs need to ignore one of
> the
> > > >>>> resulting arguments.
> > > >>>>
> > > >>>> Sadly, my fingers (and "quick memory") keep forgetting this.
> > > >>>>
> > > >>>> Thanks,
> > > >>>>
> > > >>>> --
> > > >>>> Raul
> > > >>>>
> > > >>>>> On 7/6/14, Raul Miller <[email protected]> wrote:
> > > >>>>> Meh, no, that won't work.
> > > >>>>>
> > > >>>>> Stick with Jose's version.
> > > >>>>>
> > > >>>>> (I also don't have the feature enabled which lets me cancel
> sending
> > > an
> > > >>>>> email after "sending" it.)
> > > >>>>>
> > > >>>>> I'll just go do some "practical" work now...
> > > >>>>>
> > > >>>>> Sorry for the noise.
> > > >>>>>
> > > >>>>> --
> > > >>>>> Raul
> > > >>>>>
> > > >>>>>> On 7/6/14, Raul Miller <[email protected]> wrote:
> > > >>>>>> Oops, yes. Sorry about that.
> > > >>>>>>
> > > >>>>>> I should have said:
> > > >>>>>>    amend=: (0:{::)`(1:{::)`(2:{::)}~
> > > >>>>>>
> > > >>>>>> (I'm working right now from a machine where J doesn't run, and I
> > > >>>>>> forget details when I don't test my code.)
> > > >>>>>>
> > > >>>>>> Thanks,
> > > >>>>>>
> > > >>>>>> --
> > > >>>>>> Raul
> > > >>>>>>
> > > >>>>>>> On 7/6/14, Jose Mario Quintana <[email protected]>
> > > >>>>>>> wrote:
> > > >>>>>>> Raul wrote:
> > > >>>>>>> "
> > > >>>>>>>  For example:
> > > >>>>>>>     amend=: 0&{::`(1&{::)`(2&{::)}
> > > >>>>>>>     amend 0;2 3 5;7#9
> > > >>>>>>>  9 9 0 0 9 0 9
> > > >>>>>>> "
> > > >>>>>>>
> > > >>>>>>> Actually,
> > > >>>>>>>
> > > >>>>>>>    JVERSION
> > > >>>>>>> Installer: j602a_win.exe
> > > >>>>>>> Engine: j701/2011-01-10/11:25
> > > >>>>>>> Library: 6.02.023
> > > >>>>>>>
> > > >>>>>>>    amend=: 0&{::`(1&{::)`(2&{::)}
> > > >>>>>>>    amend 0;2 3 5;7#9
> > > >>>>>>> |rank error: amend
> > > >>>>>>> |       amend 0;2 3 5;7#9
> > > >>>>>>> |[-3]
> > > >>>>>>>
> > > >>>>>>> However,
> > > >>>>>>>
> > > >>>>>>>    amend=. _: 0&{::@]`(1&{::@])`(2&{::@])} ]
> > > >>>>>>>    amend 0;2 3 5;7#9
> > > >>>>>>> 9 9 0 0 9 0 9
> > > >>>>>>>
> > > >>>>>>> I use a slight variation of this verb occasionally; yet, I find
> > the
> > > >>>>>>> forms
> > > >>>>>>> <@:v N} ] and v N} ] extremelly useful for writing tacitly
> (and I
> > > >>> write
> > > >>>>>>> tacitly all the time).
> > > >>>>>>>
> > > >>>>>>>
> > > >>>>>>>
> > > >>>>>>> On Sun, Jul 6, 2014 at 6:42 AM, Raul Miller <
> > [email protected]
> > > >
> > > >>>>>>> wrote:
> > > >>>>>>>
> > > >>>>>>>> I would agree that amend is seldom useful in much the same way
> > > that
> > > >>>>>>>> computers are seldom useful. That is: it depends on what you
> > mean
> > > >>>>>>>> by
> > > >>>>>>>> "seldom" (and, for that matter, "useful").
> > > >>>>>>>>
> > > >>>>>>>> Generally speaking, } is one of the less common characters
> that
> > I
> > > >>> use
> > > >>>>>>>> when I write in J, but I do use it.
> > > >>>>>>>>
> > > >>>>>>>> Also, in addition to the very fine 0:`[`]} which behaves
> > something
> > > >>>> like
> > > >>>>>>>> this:
> > > >>>>>>>>
> > > >>>>>>>>    2 3 5 0:`[`]} 7#9
> > > >>>>>>>> 9 9 0 0 9 0 9
> > > >>>>>>>>
> > > >>>>>>>> (Aside: note that in the above expression 2 3 5 is a word, and
> > 0:
> > > >>> is a
> > > >>>>>>>> separate word. Try ;:'2 3 5 0:`[`]} 7#9' if you want proof.)
> > > >>>>>>>>
> > > >>>>>>>> ... in addition to that approach, you can also arrange so that
> > all
> > > >>>>>>>> arguments are given in an argument list, if you use
> > > >>>>>>>> 0&{::`(1&{::)`(2&{::)}
> > > >>>>>>>>
> > > >>>>>>>> For example:
> > > >>>>>>>>    amend=: 0&{::`(1&{::)`(2&{::)}
> > > >>>>>>>>    amend 0;2 3 5;7#9
> > > >>>>>>>> 9 9 0 0 9 0 9
> > > >>>>>>>>
> > > >>>>>>>> But, as with everything, whether this is a good thing or not
> > > >>>>>>>> depends
> > > >>>>>>>> on what you are trying to do...
> > > >>>>>>>>
> > > >>>>>>>> Which leads back to the question: what are you trying to do?
> > > >>>>>>>>
> > > >>>>>>>> Thanks,
> > > >>>>>>>>
> > > >>>>>>>> --
> > > >>>>>>>> Raul
> > > >>>>>>>>
> > > >>>>>>>>> On 7/6/14, Ric Sherlock <[email protected]> wrote:
> > > >>>>>>>>> I don't agree that Amend is seldom useful. I do agree that it
> > > >>> isn't
> > > >>>>>>>>> the
> > > >>>>>>>>> easiest thing to get your head around (perhaps why you have
> > found
> > > >>>>>>>>> other
> > > >>>>>>>>> ways to getting stuff done).
> > > >>>>>>>>>
> > > >>>>>>>>> Aai has shown how to tacitly use Amend so it seems that 13 :
> is
> > > >>> not
> > > >>>>>>>>> smart
> > > >>>>>>>>> enough to give you a tacit equivalent. I suspect the reason
> > Amend
> > > >>>> has
> > > >>>>>>>> been
> > > >>>>>>>>> defined as an adverb is that it requires 3 arguments: the
> array
> > > to
> > > >>>>>>>>> amend,
> > > >>>>>>>>> the indicies to amend, the replacement data. Compare that to
> > From
> > > >>>>>>>>> which
> > > >>>>>>>>> only requires 2 bits of info (the array, the indicies).
> > > >>>>>>>>>
> > > >>>>>>>>>
> > > >>>>>>>>>
> > > >>>>>>>>> On Sun, Jul 6, 2014 at 7:53 PM, Ian Clark <
> > [email protected]
> > > >
> > > >>>>>>>>> wrote:
> > > >>>>>>>>>
> > > >>>>>>>>>> I think Erling is quite right, if you take what he says
> > > >>> literally:
> > > >>>>>>>> "Amend
> > > >>>>>>>>>> is seldom useful for indexed replacement when you write
> tacit
> > > J".
> > > >>>>>>>>>>
> > > >>>>>>>>>> I'd go further and say "Amend is seldom useful." Period. I
> > write
> > > >>> a
> > > >>>>>>>>>> lot
> > > >>>>>>>> of
> > > >>>>>>>>>> J
> > > >>>>>>>>>> code and I hardly ever use it.
> > > >>>>>>>>>>
> > > >>>>>>>>>> To someone coming from C (say), this cries out for
> > explanation.
> > > >>> In
> > > >>>>>>>>>> C,
> > > >>>>>>>> just
> > > >>>>>>>>>> about everything is done by keyhole surgery, i.e. by
> tinkering
> > > >>> with
> > > >>>>>>>>>> whatever happens to be at the end of a pointer (read:
> index).
> > In
> > > >>> J,
> > > >>>>>>>>>> just
> > > >>>>>>>>>> about nothing is done that way.
> > > >>>>>>>>>>
> > > >>>>>>>>>> Let me give an example. Suppose I want to write a verb to
> zero
> > > >>> the
> > > >>>>>>>>>> x'th
> > > >>>>>>>>>> element of a list y ...
> > > >>>>>>>>>> I can easily write it as an explicit verb:
> > > >>>>>>>>>>
> > > >>>>>>>>>>    zero=: 4 : '0 x} y'
> > > >>>>>>>>>>    3 zero i.6
> > > >>>>>>>>>> 0 1 2 0 4 5
> > > >>>>>>>>>>
> > > >>>>>>>>>> But "13 :" refuses to give me an equivalent tacit verb ...
> > > >>>>>>>>>>
> > > >>>>>>>>>>    13 : '0 x}y'
> > > >>>>>>>>>> 4 : '0 x}y'
> > > >>>>>>>>>>
> > > >>>>>>>>>> Is this just a shortcoming of "13 :" ? Does anyone know a
> > "nice"
> > > >>>>>>>>>> tacit
> > > >>>>>>>>>> equivalent? I don't.
> > > >>>>>>>>>>
> > > >>>>>>>>>> Contrast this with what happens if I switch round 0 and x
> > > >>> (...which
> > > >>>>>>>> gives
> > > >>>>>>>>>> me a verb to replace the first element of a list y with x).
> In
> > > >>> this
> > > >>>>>>>>>> case
> > > >>>>>>>>>> "13 :" does deliver me a nice simple tacit equivalent ...
> > > >>>>>>>>>>
> > > >>>>>>>>>>    13 : 'x 0}y'
> > > >>>>>>>>>> 0}
> > > >>>>>>>>>>
> > > >>>>>>>>>> So why doesn't  13 : '0 x}y'  do something equally as nice?
> > It's
> > > >>>> all
> > > >>>>>>>>>> explained in
> > > >>>>>>>>>> http://www.jsoftware.com/jwiki/Vocabulary/curlyrt#dyadic
> > > >>>>>>>>>> .
> > > >>>>>>>>>> But
> > > >>>>>>>>>> that doesn't really explain to a newcomer why Amend was
> > designed
> > > >>> as
> > > >>>>>>>>>> an
> > > >>>>>>>>>> adverb:
> > > >>>>>>>>>>     x m} y
> > > >>>>>>>>>> with (index) m as an *operand*, not an *argument*.
> > > >>>>>>>>>>
> > > >>>>>>>>>> Yes, I can write a tacit verb to zero the x'th element of
> > list y
> > > >>>> ...
> > > >>>>>>>>>>
> > > >>>>>>>>>>    zero2=: 13 : 'y * y~:x'
> > > >>>>>>>>>>    3 zero2 i.6
> > > >>>>>>>>>> 0 1 2 0 4 5
> > > >>>>>>>>>>    zero2
> > > >>>>>>>>>> ] * ~:
> > > >>>>>>>>>>
> > > >>>>>>>>>> ... but not by using Amend, which is quite simply not useful
> > in
> > > >>>> that
> > > >>>>>>>> role.
> > > >>>>>>>>>> Though I'm not claiming it can't be done - in fact there's a
> > > >>> worked
> > > >>>>>>>>>> example
> > > >>>>>>>>>> in:
> http://www.jsoftware.com/jwiki/Vocabulary/curlyrt#dyadic
> > > >>> under
> > > >>>>>>>> "More
> > > >>>>>>>>>> Information". But I wouldn't call it "nice".
> > > >>>>>>>>>>
> > > >>>>>>>>>> This illustrates the J approach to programming:
> > > >>>>>>>>>> http://www.jsoftware.com/jwiki/Vocabulary/Loopless -and how
> > it
> > > >>>>>>>> contrasts
> > > >>>>>>>>>> with the C approach. Henry would explain it far better than
> I
> > > >>> can,
> > > >>>>>>>>>> but
> > > >>>>>>>>>> he's
> > > >>>>>>>>>> busy.
> > > >>>>>>>>>>
> > > >>>>>>>>>> IanClark
> > > >>>>>>>>>>
> > > >>>>>>>>>>
> > > >>>>>>>>>> On Sat, Jul 5, 2014 at 8:59 PM, Erling Hellenäs <
> > > >>>>>>>> [email protected]>
> > > >>>>>>>>>> wrote:
> > > >>>>>>>>>>
> > > >>>>>>>>>>> Hi all !
> > > >>>>>>>>>>>
> > > >>>>>>>>>>> When you write tacit code, the index m used by Amend,
> syntax
> > > >>>>>>>> description
> > > >>>>>>>>>>>  x m} y, is a constant?
> > > >>>>>>>>>>> Normally you have a variable you want to use for indexing?
> > This
> > > >>>>>>>>>>> means
> > > >>>>>>>>>>> Amend is seldom useful for indexed replacement when you
> write
> > > >>>>>>>>>>> tacit
> > > >>>>>>>>>>> J?
> > > >>>>>>>>>>> Are there any descriptions of nice ways to do indexed
> > > >>> replacement
> > > >>>>>>>>>>> in
> > > >>>>>>>>>> tacit
> > > >>>>>>>>>>> J?
> > > >>>>>>>>>>> As with Amend, the result has to be a new variable, of
> > course.
> > > >>>>>>>>>>>
> > > >>>>>>>>>>> Cheers,
> > > >>>>>>>>>>>
> > > >>>>>>>>>>> Erling Hellenäs
> > > >>>>
> > ----------------------------------------------------------------------
> > > >>>>>>>>>>> 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

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