Hi Mike
You request comments regarding style. Style is a matter of taste, so don't take
my comments as criticism.
Your very first expression
(n%2)>(]?]) n$d
can be written without division:
n>+:(?])n#dThe value depends on two variable, n and d, and so you may create
a dyadic verb, focusing attention on functions rather than on variables.
n( 4 : 'x>+:(?]) x#y')d
or, using tacit code:
n([>[:+:[:(?])#)d
Your questions:
1) how do I avoid @ especially once we remove explicit arguments?
- by using cap. ([:)
4) Is there a good way to have named variables (ie. avoid getx, gety)?
replace
getx =: 0{ ]
gety =: 1{ ]
revDom =: getx *. +./ @ (gety # [)
with
revDom =: (0{ ]) *. +./ @ ((1{ ]) # [)
5) Why is a hook the default and not composition?
- Because J'ers love hooks! For composition use the capped fork ([: f g)
-Bo
>________________________________
> Fra: Michal D. <michal.dobrog...@gmail.com>
>Til: programm...@jsoftware.com
>Sendt: 6:01 fredag den 2. november 2012
>Emne: [Jprogramming] Arc consistency in J
>
>Hi All,
>
>I've managed to write my first not-completely-trivial program in J. It
>implements an arc consistency algorithm (
>http://en.wikipedia.org/wiki/Local_consistency#Arc_consistency). I would
>appreciate any comments regarding style, what I'm doing wrong in J or how
>to improve the code. I also have a couple of questions of my own:
>
>1) how do I avoid @ especially once we remove explicit arguments?
>2) how do I avoid constant boxing/unboxing due to fill (see arcsX)?
>3) Is a boxed value always a pointer? One could imagine implementing
>'ragged' arrays without pointers.
>4) Is there a good way to have named variables (ie. avoid getx, gety)?
>5) Why is a hook the default and not composition?
>
>Code at: http://pastebin.com/k4XuKfFi
>
>Cheers!
>
>Mike
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>
>
>
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