require 'strings' NB. require needed for j6, irrelevant for j7
<@toupper@> 'this';'is';'a';'test'
+----+--+-+----+
|THIS|IS|A|TEST|
+----+--+-+----+
Here's an explicit equivalent that does not require rank and does not use @
a=: toupper 0 {:: 'this';'is';'a';'test'
b=: toupper 1 {:: 'this';'is';'a';'test'
c=: toupper 2 {:: 'this';'is';'a';'test'
d=: toupper 3 {:: 'this';'is';'a';'test'
a;b;c;d
+----+--+-+----+
|THIS|IS|A|TEST|
+----+--+-+----+
That said, note that 'require rank' is a confusing phrase. Any use of J
verbs or nouns requires rank, since every J verb has a verb rank and every
J noun has a noun rank. However, since this interpretation is too
restrictive, I have presumed that you meant 'does not use the rank
conjunction'.
--
Raul
2011/12/6 Linda Alvord <[email protected]>
> Can you make a simple example that looks like this u@v@w ? Please use
> actual verbs so that it is a tight little nugget that might come about in a
> fairly simple mathematical situation. Use it in a situation that does not
> require rank. Next, write it in explicit form without @
>
> Here's what I would like. Remember foo ?
>
> foo=: 13 :'an expression with x's and y's and three verbs like # , %: ,
> ? or * '
>
>
> Also:
>
> Let us use [: u v or u@:v as we like, and specify a rank when we
> need one.
>
> I think I could live with:
>
> Let us use [: u v unless rank is involved. Only use u@:v if rank is
> needed, thus @ vanishes from the planet.
>
>
> Linda
>
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Henry Rich
> Sent: Monday, December 05, 2011 10:08 PM
> To: Programming forum
> Subject: Re: [Jprogramming] Turkey Roll - Challenge 2
>
> If you are OK with @: , then we agree. @ is hard for beginners.
>
>
> u@v is equivalent to u@:v"v or ([: u v)"v
>
> u@v@w is u@:v"v@:w"w or ([: ([: u v)"v w)"w
>
> Henry Rich
>
> On 12/5/2011 9:57 PM, Linda Alvord wrote:
> > Can you make a simple example that looks like this u@v@w . Is it
> possible
> > to write an explicit version that will create a tacit expression to do
> the
> > same thing?
> >
> > I don't have a problem with @: . My concern is only with @
> >
> > Linda
> >
> > -----Original Message-----
> > From: [email protected]
> > [mailto:[email protected]] On Behalf Of Henry Rich
> > Sent: Monday, December 05, 2011 9:28 PM
> > To: Programming forum
> > Subject: Re: [Jprogramming] Turkey Roll - Challenge 2
> >
> > I don't understand why u@v is anything other than 'right to left'. It
> > means do v, then do u. u@v@w means w, then v, then u.
> >
> > The complication of @ is not its ordering, it's its rank. In my classes
> > I teach @: as a primitive. We don't use [:, or @ .
> >
> > Henry Rich
> >
> > On 12/5/2011 9:15 PM, Linda Alvord wrote:
> >>
> >> Compare your expression for dice :
> >>
> >> faces=: {&' o'@((i.3 3)e.&":"1])&.>4 80 840 8620 86420 865320
> >> faces
> >> ------T-----T-----T-----T-----T-----┐
> >> │ │o │o │o o│o o│o o│
> >> │ o │ │ o │ │ o │o o│
> >> │ │ o│ o│o o│o o│o o│
> >> L-----+-----+-----+-----+-----+------
> >>
> >> With Kip Murray's version:
> >>
> >> one =: ' ',' o ',:' '
> >> two =: 'o ',' ',:' o'
> >> three =: 'o ',' o ',:' o'
> >> four =: 'o o',' ',:'o o'
> >> five =: 'o o',' o ',:'o o'
> >> six =: 'o o','o o',:'o o'
> >> ]dice =: one;two;three;four;five;six
> >> ----T---T---T---T---T---┐
> >> │ │o │o │o o│o o│o o│
> >> │ o │ │ o │ │ o │o o│
> >> │ │ o│ o│o o│o o│o o│
> >> L---+---+---+---+---+----
> >>
> >> Your dice are great looking! However that change has greatly increased
> the
> >> complexity of the code. Also, there is a condition of the challenge to
> >> exclude @ in each expression. This requirement encourages considering
> > the
> >> execution from the right toward the left. In your example 4 80 840
> 8620
> >> 86420 865320 could be puzzling to a beginner. Your other ideas are
> >> thoughtful ideas to incorporate in an actual design of a program. At
> this
> >> stage, I'm trying to raise issues that can be discussed and explored
> >> further.
> >>
> >> From your design so far, is it possible for you to capture the actual
> > values
> >> of the and display them following each toss ? It is this data that
> > will
> >> be useful as you finish the challenge.
> >>
> >> Linda
> >>
> >>
> >> -----Original Message-----
> >> From: [email protected]
> >> [mailto:[email protected]] On Behalf Of Raul Miller
> >> Sent: Monday, December 05, 2011 9:50 AM
> >> To: Programming forum
> >> Subject: Re: [Jprogramming] Turkey Roll - Challenge 2
> >>
> >> Personally, I have been baffled by a number of the choices and
> > requirements
> >> here. And, by this, I mean that I do not understand them.
> >>
> >> That said, here is my current interpretation of a mix of some of the
> >> statements expressed here, about what is being accomplished:
> >>
> >> faces=: {&' o'@((i.3 3)e.&":"1])&.>4 80 840 8620 86420 865320
> >> toss=: (] {~ (?@$ #)) ".bind 'faces'
> >>
> >> Example use, with ascii box drawing enabled:
> >>
> >> toss 2 10
> >> +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
> >> |o |o |o o|o |o |o |o |o o|o o|o o|
> >> | o | o | o | o | o | | | | o |o o|
> >> | o| o|o o| o| o| o| o|o o|o o|o o|
> >> +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
> >> |o |o o|o |o o|o o|o |o |o |o o|o |
> >> | o | o | | o | | | | | | |
> >> | o|o o| o|o o|o o| o| o| o|o o| o|
> >> +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
> >> toss 2 10
> >> +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
> >> |o |o |o o|o |o o|o |o o|o o|o o|o |
> >> | | | | o |o o| o | | o |o o| |
> >> | o| o|o o| o|o o| o|o o|o o|o o| o|
> >> +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
> >> |o o|o |o o|o o|o o|o o| |o o|o o|o o|
> >> | | | o | | | o | o | | | |
> >> |o o| o|o o|o o|o o|o o| |o o|o o|o o|
> >> +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
> >>
> >> Notes:
> >>
> >> 1. I spaced my pips out wider, horizontally, than the original. I think
> >> this looks better.
> >> 2. toss has 'faces' as an implicit dependency
> >> 3. I can change the number of dice being tossed by changing the argument
> > to
> >> toss
> >>
> >> In my opinion, this is not a very good design. In "real life" code, I
> >> would either replace (". bind 'faces') with (faces) or I would make it
> an
> >> argument to the function.
> >>
> >> I could probably compress a few characters out of the definition of
> faces,
> >> but it would become more mysterious if I did so.
> >>
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