My vote is for Henry's special code. Simon
-----Original Message----- From: programming-boun...@jsoftware.com [mailto:programming-boun...@jsoftware.com] On Behalf Of Linda Alvord Sent: 29 March 2012 14:24 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
