To elaborate on Raul's answer: the "format" verb ": formats a number, simply converting a number to a character vector when used monadically; its inverse is the "do" verb ". which executes a character string as a J expression, so the character representation of a number is turned into the number represented.
On Tue, Apr 9, 2019 at 4:12 PM Raul Miller <rauldmil...@gmail.com> wrote: > Probably the simplest approach would be: > > |.&.": 123 > 321 > > If you're doing something unusual, though, maybe we'd need to do something > else? > > Thanks, > > -- > Raul > > On Tue, Apr 9, 2019 at 4:07 PM Thomas Bulka <thomas.bu...@posteo.de> > wrote: > > > > Hi everyone, > > > > while working my way through the problems on Project Euler, I stumbled > > over a question which might be completely trivial - however, I have not > > been able to find an answer, yet. > > > > Say, I want to reverse the digits of a number (that is, I want to turn > > 123 into 321) - how do I do that? Of course, |. does not work, since 123 > > is not an array. Is there a way to turn a number into a string (and the > > other way round). Or is there a better way? > > > > Probably I've been looking in the wrong direction, so I'd very much > > appreciate any help on that topic. > > > > Thank you very much in advance! > > > > Regards, > > > > Thomas > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm -- Devon McCormick, CFA Quantitative Consultant ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
