Cute. 142857 is immediately recognizable to me as the decimal expansion of %7 .
1. The dyad =/ is the function table for = . The monad =/ inserts = between items of the argument. Thus =/1 4 2 8 5 7 is 1=4=2=8=5=7 which, because of the right-to-left evaluation and because x=y is 0 or 1, does not mean the same as it does in conventional math notation. 2. The left-hand-side of assignment must be a name or a string satisfying certain conditions. 4. The "capped fork" [: f g is the same as f@:g . 3. Yes, for example: >: ^: (1 < [: [EMAIL PROTECTED] [: /:~@":"0 (>:i.6) * ]) ^: _ ] 1 142857 f^:proposition^:_ y is a common construct, meaning z=. y while. proposition y do. z=. f z end. ----- Original Message ----- From: Geoff Canyon <[EMAIL PROTECTED]> Date: Tuesday, March 20, 2007 1:15 am Subject: Re: [Jprogramming] monad vs. dyad > Thanks for the help! > > 0 is the obvious answer, but there are other numbers that meet > this > criteria. > > I modified your code like this: > > f=:((1<])#@:~.@:(/:~@:":"0)@:((>:i.6)*]))+] > (f^:_) 1 > > And got my answer. This leaves me with the following questions: > > 1. So what _does_ =/ mean? > 2. If it doesn't mean anything, is it possible for me (any user) > to > define =/=:1&=#] ? (apparently not) > 3. Is there a way to compose my two lines above into a single command? > 4. To avoid all the @: above, should I be looking for ways to turn > it > into forks and/or hooks? > > I have to add: my brain hurts! (in a good way) ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
