Thanks, everyone! One more little thing, though:
ijoin =: (-.&' ') &. ": : [: x: ijoin 1234567 456789 23345567 34446 12345674567892334307966976 The conversion back to number from character string causes precision to be lost. this is due to ":^:_1 How can I incorporate an x: (or equivalent) into the "ijoin" verb, to ensure correct bignums? I did a site search under google but couldn't find anything obvious. On 9 September 2013 14:14, Dan Bron <j...@bron.us> wrote: > Oh yes, you're right. Thanks for the catch. > > -Dan > > -----Original Message----- > From: programming-boun...@forums.jsoftware.com > [mailto:programming-boun...@forums.jsoftware.com] On Behalf Of R.E. Boss > Sent: Monday, September 09, 2013 5:28 AM > To: programm...@jsoftware.com > Subject: Re: [Jprogramming] Joining up a rank-1 array of integers > > Wasn't it > (, '/' -. {:) '/some/path' > ? > > > R.E. Boss > > (Add your info to http://www.jsoftware.com/jwiki/Community/Demographics ) > > > -----Original Message----- > From: programming-boun...@forums.jsoftware.com > [mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Dan Bron > Sent: maandag 9 september 2013 5:48 > To: programm...@jsoftware.com > Subject: Re: [Jprogramming] Joining up a rank-1 array of integers > > That's one of my favorite J idioms! > > A similarly elegant phrase arising from the use of -. is (, '/' -.~ {:) > '/some/path' . This ensures all paths end in a slash, without duplicating > slashes in paths that are already in canonical form. To appreciate its > elegance, write an analogous function on another language of your choice, > then compare it to the J: did you notice that the J only has a single > reference (direct or indirect) to the constant '/'? How many were used in > the othe language? (Now, try transliterating the two algorithms to English. > Fun game.) > > Brian McGuiness showed this pattern to me in 2010 and it blew me away (and > I'd been studying J for decade at the time; it's an endless thrill) [1]. > > -Dan > > [1] J as a declarative language: > > http://www.jsoftware.com/pipermail/programming/2010-January/017673.html > > > > > > N > consider that there is only a single reference to the constant '/' (direct > or indirect), and then try and how you would express function in another > language w > > Please excuse typos; composed on a handheld device. > > On Sep 8, 2013, at 11:16 PM, Joey K Tuttle <j...@qued.com> wrote: > > > Another (related, and also using -. (twice!)) expression that I use a > > lot for getting just the digits from a string - > > > > digits=: -.&(a.-.'0123456789') > > > > digits ": 23 45 6 > > 23456 > > > > > > On 2013/09/08 19:54 , Alex Giannakopoulos wrote: > >> That 'less' verb is very useful, I'd never had occasion to use it until > now! > >> It could have been a bit more hyped up in the documentation, though, > >> I'd never even seen it used before! (blush) > >> > >> > >> > >> On 9 September 2013 03:46, Alex > Giannakopoulos<aeg...@blueyonder.co.uk>wrote: > >> > >>> >Ah, OK, now I got it! > >>> > > >>> >(": 23 45 6) -. ' ' > >>> > > >>> >23456 > >>> > > > ---------------------------------------------------------------------- > > 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 > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
