no problem From: Dan Bron <[email protected]> To: J Programming <[email protected]> Sent: Monday, August 8, 2011 8:23 AM Subject: Re: [Jprogramming] Subject: monadic rank of roll and deal
Ah, yes, sorry. Didn't read in detail, apologies for the noise. -Dan Please excuse typos; composed on a handheld device. -----Original Message----- From: Raul Miller <[email protected]> Sender: [email protected] Date: Mon, 8 Aug 2011 11:10:03 To: Programming forum<[email protected]> Reply-To: Programming forum <[email protected]> Subject: Re: [Jprogramming] Subject: monadic rank of roll and deal _ was not an output, it was part of the rank. -- Raul On Mon, Aug 8, 2011 at 10:48 AM, Dan Bron <[email protected]> wrote: > I think the more puzzling behavior here isn't that ?. is different from ? but > that ?. is giving a manifestly incorrect result wrt its definition. Whatever > rank ?. is, each element of its result should be strictly less than the > corresponding atom of its argument. Also an output of_ is just nonsensical, > no matter what the input. > > > I appreciate Raul's comment re the distaste for ?. generally, but I think > that's more applicable to your observation re rank than REB's re_ , which is > a bug and should be fixed. > > -Dan > > > > Please excuse typos; composed on a handheld device. > > -----Original Message----- > From: Mark Niemiec <[email protected]> > Sender: [email protected] > Date: Mon, 8 Aug 2011 07:20:35 > To: J Programming Forum<[email protected]> > Reply-To: Programming forum <[email protected]> > Subject: [Jprogramming] Subject: monadic rank of roll and deal > > "R.E. Boss" <[email protected]> wrote: > >> ? b. 0 >> >> 0 0 0 >> >> >> >> ?. b. 0 >> >>_ 0 0 >> >> >> >> Is this intended? > > ?.10#10 > 6 5 9 2 4 9 0 7 0 4 > ?."0]10#10 > 6 6 6 6 6 6 6 6 6 6 > > Before 6.02, ?. had rank 0, which caused inconsistent behavior, > since "0 should have no effect on a verb that is already rank 0. > > It is impossible to write a user-defined verb that emulates the > behavior of ?. without making its rank infinite. As far as I know, > this was the only J primitive that had this kind of behavior. > > -- Mark D. Niemiec <[email protected]> > ---------------------------------------------------------------------- > 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
