Hi Roger; Thanks for the info on jot. I myself would have been more specific about i.0 and #io but, needless to say, I'm not that kind of egg.
------------------------------------------------------------------------ |\/| Randy A MacDonald | APL: If you can say it, it's done.. (ram) |/\| [EMAIL PROTECTED] | |\ | | The only real problem with APL is that BSc(Math) UNBF'83 | it is "still ahead of its time." Sapere Aude | - Morten Kromberg Natural Born APL'er | Demo website: http://156.34.68.75/ -----------------------------------------------------(INTP)----{ gnat }- ----- Original Message ----- From: "Roger Hui" <[EMAIL PROTECTED]> To: "General forum" <[email protected]> Sent: Friday, March 16, 2007 4:49 PM Subject: Re: [Jgeneral] definition of a: > No, I mean that {iota}0 depends on {quad}io, which > is what said. > > a: is what used to be denoted {jot} in "Practical > Uses of a Model of APL" from APL82 (and > subsequently "Rationalized APL" and "A Dictionary > of APL"). This reinterpretation of {jot} was > invented by Arthur Whitney in 1981. To my knowledge > it predates any use of zilde in APL. > > > > ----- Original Message ----- > From: ramacd <[EMAIL PROTECTED]> > Date: Friday, March 16, 2007 12:43 pm > Subject: Re: [Jgeneral] definition of a: > > > Hi Roger; > > > > Okay... you mean it fails if []io is undefined. I'd say that > > 'depends on the > > existence of X' and 'depends on the value of X' are distinct > > enough not to > > be coverable by 'depends on X' I'm also young enough to barely > > remember IO > > IMPLICIT ERROR's. I also got used to using the zilde (0 overstrike > > ~) which > > probably was what generated the idea of a: in the first place, but > > I wasn't > > on that plane ride. > > > > > ----- Original Message ----- > > From: "Roger Hui" <[EMAIL PROTECTED]> > > To: "General forum" <[email protected]> > > Sent: Friday, March 16, 2007 4:31 PM > > Subject: Re: [Jgeneral] definition of a: > > > > > > > Execute foo in your APL where > > > > > > {del} z {is} foo ; {quadio} > > > z {is} {iota} 0 > > > {del} > > > > > > > > > > > > ----- Original Message ----- > > > From: ramacd <[EMAIL PROTECTED]> > > > Date: Friday, March 16, 2007 12:19 pm > > > Subject: Re: [Jgeneral] definition of a: > > > > > > > Hi Roger; > > > > > > > > Ok, I'm stumped: how does {iota}0 depend on {quad}io? > > > > > > > > >: ... > > > > > > > > > > > > > ----- Original Message ----- > > > > From: "Roger Hui" <[EMAIL PROTECTED]> > > > > To: "General forum" <[email protected]> > > > > Sent: Friday, March 16, 2007 12:49 PM > > > > Subject: Re: [Jgeneral] definition of a: > > > > > > > > > > > > > I started using {rho}0 to denote the empty list > > > > > in APL because (a) it is shorter than 0{rho}0 > > > > > (b) it does not depend on {quad}io like {iota}0 > > > > > does (c) it has right "type" where '' does not. > > > > > >From APL to J {rho}0 got changed to $0. > > > > > > > > > > Of course strictly speaking it should be "an empty > > > > > list" rather than "the empty list". But the > > > > > differences between the various empty lists are > > > > > more amusing than significant. When I was a mere > > > > > pup I used to pester and annoy the APL implementers > > > > > with questions like: What is the difference > > > > > between ({iota}0),'' and '',({iota}0) and why? > > > > > I guess payback exists after all. > > > > > > > > > > > > > > > > > > > > ----- Original Message ----- > > > > > From: [EMAIL PROTECTED] > > > > > Date: Wednesday, March 14, 2007 1:56 pm > > > > > Subject: Re: [Jgeneral] definition of a: > > > > > > > > > > > The" weather" comment is funny but as I said: "I am from a > > > > > > different > > > > > > cultural background" so making fun of my mistakes in English > > > > is > > > > > > fine with > > > > > > me,since I have a good sense of humor. > > > > > > > > > > > > The empty list is exactly what I wanted (refer to the early > > > > > > discussions of > > > > > > <i.0 > > > > > > > > > > > > The question was, as everyone can read from my earlier post: > > > > > > Roger ! any enlightening comment ? > > > ----------------------------------------------------------------- > > ----- > > > 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
