I guess I'm still an APL programmer at heart, despite admiring how powerful J is, and how fluent the contributors are to these forums. I must do Ian Clark's J In A Day sometime to get more of a feel for J.
Did your original code really come down to a=<'Qsc'? I wondered if there might be some extra magic in there to handle arguments of different depths or ranks. Anyway, I'm enjoying following the discussions stimulated by your posts and I'll try a bit harder to learn from them as they come along. -----Original Message----- From: programming-boun...@jsoftware.com [mailto:programming-boun...@jsoftware.com] On Behalf Of Linda Alvord Sent: 30 March 2012 07:32 To: 'Programming forum' Subject: Re: [Jprogramming] one element list of an integer to an atom What fun! When I saw this: <'Qsc' +---+ �Qsc� +---+ and visualized this: a +-----------------------+ �N�A�Q�GS�G�GM�S�Qsc�AUS� +-----------------------+ The answer just jumped off the page! a=<'Qsc' 0 0 0 0 0 0 0 1 0 I enjoyed the time I spent with examples of E. and am sure it will come in handy in the future. But thanks so much for the wakeup call. I have gotten excited about J in the last few months and maybe you'll also find it fun to scramble some of your ways of thinking about APL to match what is possible using J . Thanks again. I knew there was an easier way! Linda -----Original Message----- From: programming-boun...@jsoftware.com [mailto:programming-boun...@jsoftware.com] On Behalf Of Simon Barker Sent: Thursday, March 29, 2012 10:26 AM To: 'Programming forum' Subject: Re: [Jprogramming] one element list of an integer to an atom Hi Linda, Despite having followed these forums for several years I still can't read J very well, mainly because I don't actually use it that often, but if I understand what you are trying to do, does this fit the bill: a E.~ <'Qsc' 0 0 0 0 0 0 0 1 0 a E.~ <'N' 1 0 0 0 0 0 0 0 0 Simon -----Original Message----- From: programming-boun...@jsoftware.com [mailto:programming-boun...@jsoftware.com] On Behalf Of Linda Alvord Sent: 29 March 2012 15:01 To: 'Programming forum' Subject: Re: [Jprogramming] one element list of an integer to an atom Here's how I came upon the problem. a=:'N';'A';'Q';'GS';'G';'GM';'S';'Qsc';'AUS' f=: 13 :'>"0,L:0 y' d=: 13 :'(''''$,}.$f y)=+/"1 ((}.$f y){.>x)="1 f y' 'Qsc' d a 0 0 0 0 0 0 0 1 0 'N' d a 1 0 0 0 0 0 0 0 0 a --T-T-T--T-T--T-T---T---� �N�A�Q�GS�G�GM�S�Qsc�AUS� L-+-+-+--+-+--+-+---+---- Surely, this can be improved upon. Linda -----Original Message----- From: programming-boun...@jsoftware.com [mailto:programming-boun...@jsoftware.com] On Behalf Of Linda Alvord Sent: Thursday, March 29, 2012 9:24 AM To: 'Programming forum' Subject: Re: [Jprogramming] one element list of an integer to an atom Here's a summary of all your good ideas: ]a=:1$3 3 ]b=:1 1 1 1$3 3 (0{,b)=2 3 4 3 6 0 1 0 1 0 ({.,b)=2 3 4 3 6 0 1 0 1 0 (,/b)=2 3 4 3 6 |length error | (,/b) =2 3 4 3 6 (,/a)=2 3 4 3 6 0 1 0 1 0 ]a=:1$3 3 ]b=:1 1 1 1$3 3 (0{,b)=2 3 4 3 6 0 1 0 1 0 ({.,b)=2 3 4 3 6 0 1 0 1 0 (,/b)=2 3 4 3 6 |length error | (,/b) =2 3 4 3 6 (,/a)=2 3 4 3 6 0 1 0 1 0 ''$,b 3 Thanks to everyone! All work for one element list. Some are more versatile than that. I had remembered only $, from APL, but couldn't make it work because it doesn't. I guess special code ''$,b is the way to go. Do you agree. Linda -----Original Message----- From: programming-boun...@jsoftware.com [mailto:programming-boun...@jsoftware.com] On Behalf Of Simon Barker Sent: Thursday, March 29, 2012 6:47 AM To: 'Programming forum' Subject: Re: [Jprogramming] one element list of an integer to an atom The old APL idiom was '' {reshape} data which translates as '' $ , data In J. -----Original Message----- From: programming-boun...@jsoftware.com [mailto:programming-boun...@jsoftware.com] On Behalf Of Linda Alvord Sent: 29 March 2012 09:20 To: 'Programming forum' Subject: [Jprogramming] one element list of an integer to an atom a=:1$3 a 3 3= 2 3 5 3 4 0 1 0 1 0 a= 2 3 5 3 4 |length error | a =2 3 5 3 4 ".a |domain error | ".a a+5 8 Clearly, a is numeric. How can I change a to a numeric atom 3 , rather than a one element list 3 ? I need to find where the 3's are in a list. The result of executing some expression has produced a one item list of a 3 . I think I may have known how in APL once upon a time. Linda ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
