Here's a tacit variation, where we filter scalars before making pairs: (0&, #: ,@(</~)@i. # [EMAIL PROTECTED]:) each 3 4 5 +---+---+---+ |0 1|0 1|0 1| |0 2|0 2|0 2| |1 2|0 3|0 3| | |1 2|0 4| | |1 3|1 2| | |2 3|1 3| | | |1 4| | | |2 3| | | |2 4| | | |3 4| +---+---+---+
> From: Ken Chakahwata <[EMAIL PROTECTED]> > > Oops, finger happy! > > pair8 =: 3 : 0 > t =. (0,y)#: i. (*<:) y > t =. (</"1 t)#t > > ken > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Roger Hui > Sent: 10 November 2008 21:37 > To: Programming forum > Subject: Re: [Jprogramming] pairs > > Actually, the "amend" idea does not use boxing. > > pair6a=: 3 : 0 > t=. ((2!y),2)$0 1+0 > t=. (1,.-.(-i.)y-2) (}:+/\(-i.)y-1)}t > +/\t > ) > > However, the idea of generating all possible pairs and > then selecting the suitable ones is good. Variations on > that theme: > > pair7 =: (> pair7a=: (> > > > ----- Original Message ----- > From: Andrew Nikitin > Date: Monday, November 10, 2008 11:26 > Subject: [Jprogramming] pairs > To: J programming > > > > > I haven't seen a flat version, that is the one that does not use > > boxing. If I just missed it, sorry for duplication. If there > > wasn't one then here it is. > > > > (> ---------------------------------------------------------------------- > 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
