I have a feeling its gone forever... there's no obvious way to unappend (append ^:_1) a list.
so, you need to save the context: 4 4$ (,&]/) i. 4 4 3 or (}: $ ,&]/@:i.) 4 4 3 ----- Original Message ---- From: David Vincent-Jones <[EMAIL PROTECTED]> To: Programming forum <[email protected]> Sent: Monday, April 9, 2007 12:31:10 PM Subject: RE: [Jprogramming] Singleton Reduction Obviously I didn't fully explain myself ... try again! A=: ,&]/ i. 4 4 3 $A 16 3 Now I would like to reverse A back to $ 4 4 3 David -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of David Vincent-Jones Sent: Sunday, April 08, 2007 17:43 To: 'Programming forum' Subject: RE: [Jprogramming] Singleton Reduction How would one reverse that reduction? $ ,&]/ i. 4 4 3 16 3 Assuming one knew the original form, from 16 3 back to 4 4 3 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dan Bron Sent: Sunday, April 08, 2007 16:40 To: 'Programming forum' Subject: RE: [Jprogramming] Singleton Reduction Leigh wrote: > I've noticed that with a rank adverb (i.e., ,"_1 / ) your prefered > solution works. Raul countered: > $,/"_1]i. 1 2 3 > 1 6 Ok then: $ ,&]/ i. 1 2 3 2 3 $ ,&]/ 1$'a' By definition, ,&]/ and ,/ can't differ; but since ,&]/ isn't supported by special code, it doesn't suffer from the bug indicated by Roger. OTOH, since it isn't supported by special code, it is not as efficient as ,/ . But it's nearly as terse, equally understandable, and is, until the next release, more reliable than its optimized counterpart. -Dan ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm __________ NOD32 2173 (20070407) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm __________ NOD32 2173 (20070407) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
