When n=7, d=3, D will contain only 1s while E will typically contain a mix of 1s and 0s.
I do not know enough about the purpose of this code to comment on which is better. -- Raul On Mon, Nov 5, 2012 at 5:11 AM, Linda Alvord <lindaalv...@verizon.net> wrote: > I just began to ponder this thread. Do you think E is the same as D? > > D=. (n%2) > (?]) n$d > E=. ?(n,d)$2 > > Linda > > -----Original Message----- > From: programming-boun...@forums.jsoftware.com > [mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Michal D. > Sent: Sunday, November 04, 2012 11:26 PM > To: programm...@jsoftware.com > Subject: Re: [Jprogramming] Arc consistency in J > >> >> variables. In other words, if we specify the constraint x < y it >> >> looks like either x1 < x2 or x2 < x1 is sufficient to satisfy arc >> >> consistency. In other words, i think we should always use the >> >> symmetric closure of the constraint. >> > >> >> Does this sound valid to you? >> > >> > Unfortunately not. There are no values that can satisfy x1<x2 and > x2<x1. >> > If this was the case all csps would have no solutions >> >> I meant x1<x2 OR x2<x1 >> >> So symmetric closure was the wrong term for me to use. >> >> But I think we want to be using intersection of the relationship with >> its inverse. >> >> Does that sound right to you? >> > > Sorry I missed the or. Unfortunately not, I mean you can have a constraint > like that if you want but you don't have to have to in general. I think > we're dwelling on an implementation detail. They (wikipedia) must just have > the < constraint propagating both ways. > > My brain is fried but I did hack together an ugly search procedure. You can > try it out on a sudoku puzzle if you want. For some reason I couldn't > generate it using the code you gave me. http://pastebin.com/2zPB4DBA > > Maybe we can update the printf docs to say: > load 'format/printf' > http://www.jsoftware.com/help/jforc/input_and_output.htm > > Cheers, > > Mike > ---------------------------------------------------------------------- > 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
