Or >:i. On Dec 31, 2018 10:34 AM, "Raul Miller" <[email protected]> wrote:
In every culture, some traditions are worth keeping, while some are worth abandoning (and some are so entrenched that they're best encapsulated and tolerated). Details of our calendar (which date back to the Roman Empire) are probably best treated in much the same way we treat details of roman numerals. Or, my take: surviving roman traditions tend to work well enough for their purpose, but do not work well enough for all similar purposes... (there's a reason, for example, why people in astronomical communities deal with leap seconds, and why they mostly ignore months in their time keeping efforts...) Also, I've used quadIO. For people who don't know: that was APL's tactic for dealing with different concepts of the numerical value of the first element of an array. But quadIO was a complete pain that hit me every time I needed to use numeric indices. On the other hand, the problems surrounding APL's quadIO did have the benefit of discouraging me from using indices wherever possible. But this had a significant disadvantage also: sometimes the resulting code was way more elaborate than I anticipated when I started writing it. (Which, in turn, is a big deal when you're phasing things into production over time, based on an agreed-on end goal.) That said, this works just fine: 1+i.2 4 1 2 3 4 5 6 7 8 (And, for anyone keeping track, *this* time I used copy and paste, rather than hand typing onto my phone from an untrusted computer.) Thanks, -- Raul On Sun, Dec 30, 2018 at 6:13 PM 'Bo Jacoby' via Programming <[email protected]> wrote: > > New year's day is January the first, not January the zeroth. > 'The first' is an ordinal number - not a cardinal number. > A zero-origin index counts how many elements to skip before reaching a certain element. It is a cardinal number - not an ordinal number. Zero is a cardinal number - 'zeroth' is not an ordinal number. > Not distinguishing cardinal numbers from ordinal numbers creates confusion. > Thanks. Bo. > Den søndag den 30. december 2018 18.54.48 CET skrev Henry Rich < [email protected]>: > > That's the correct result. #\ operates on prefixes of y, which are tables. > > Henry Rich > > > On 12/30/2018 12:28 PM, Linda Alvord wrote: > > #\i.8 3 > > 1 2 3 4 5 6 7 8 > > > > Sorry, Linda > > > > > > > > Sent from my Verizon, Samsung Galaxy smartphone > > > > > > -------- Original message -------- > > From: Linda Alvord <[email protected]> > > Date: 12/30/18 12:24 PM (GMT-05:00) > > To: [email protected] > > Subject: Re: [Jprogramming] One-based indices > > > > This doesn't work. > > > > #i.8 3 > > 1 2 3 4 5 6 7 8 > > > > > > Linda > > > > Sent from my Verizon, Samsung Galaxy smartphone > > > > > > -------- Original message -------- > > From: Henry Rich <[email protected]> > > Date: 12/30/18 12:08 AM (GMT-05:00) > > To: [email protected] > > Subject: Re: [Jprogramming] One-based indices > > > > Seconded. If you must create lists starting at 1, keep in mind > > > > #\ 'abcdefgh' > > > > 1 2 3 4 5 6 7 8 > > > > > > which Roger even supported with special code. > > > > > > Henry Rich > > > > > > > > > > On 12/29/2018 11:49 PM, Roger Hui wrote: > >> Why not use >:@i. ? > >> > >> WRT a 1-origin primitive, don't do it! Even non-APL people know this. > >> See *Why > >> numbering should start at zero > >> < https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.cs.utexas.edu%2Fusers%2FEWD%2Fewd08xx%2FEWD831.PDF&data=02%7C01%7C%7C9e44f8b9de4d49a54aac08d66e7b98c7%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636817874454098584&sdata=SwB6%2FtOljN%2BEhNXUoESr4X4bSNi4a3lOTXbbTiw97C0%3D&reserved=0 >.* > >> > >> 1-origin *delenda est*. > >> > >> > >> > >> On Sat, Dec 29, 2018 at 8:22 PM 'Skip Cave' via Programming < > >> [email protected]> wrote: > >> > >>> I find that I need to use the expression 1+i.x much more often than I use > >>> i.x. > >>> Would it make sense to define the primitive i; as the one-origin version of > >>> i.? > >>> > >>> i. 5 > >>> > >>> 0 1 2 3 4 > >>> > >>> i; 5 > >>> > >>> 1 2 3 4 5 > >>> > >>> i. 2 3 > >>> > >>> 0 1 2 > >>> > >>> 3 4 5 > >>> > >>> i; 2 3 > >>> > >>> 1 2 3 > >>> > >>> 4 5 6 > >>> > >>> > >>> This avoids all the side effects of quad IO in APL but provides a handy way > >>> to generate one-based indices. > >>> > >>> > >>> Skip > >>> ---------------------------------------------------------------------- > >>> For information about J forums see https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.jsoftware.com%2Fforums.htm&data=02%7C01%7C%7C9e44f8b9de4d49a54aac08d66e7b98c7%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636817874454098584&sdata=rEAdhjw7xl8avJsOiugshj1EZffAbHvUKhhjF2hbEQg%3D&reserved=0 > >> ---------------------------------------------------------------------- > >> For information about J forums see https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.jsoftware.com%2Fforums.htm&data=02%7C01%7C%7C9e44f8b9de4d49a54aac08d66e7b98c7%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636817874454098584&sdata=rEAdhjw7xl8avJsOiugshj1EZffAbHvUKhhjF2hbEQg%3D&reserved=0 > > > > > > --- > > This email has been checked for viruses by AVG. > > https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.avg.com&data=02%7C01%7C%7C9e44f8b9de4d49a54aac08d66e7b98c7%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636817874454098584&sdata=p0QxrFpfFhA9pyQ%2FZRa6Ekin4BNKn3BLvWGk%2Fqe3W3A%3D&reserved=0 > > ---------------------------------------------------------------------- > > For information about J forums see https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.jsoftware.com%2Fforums.htm&data=02%7C01%7C%7C9e44f8b9de4d49a54aac08d66e7b98c7%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636817874454098584&sdata=rEAdhjw7xl8avJsOiugshj1EZffAbHvUKhhjF2hbEQg%3D&reserved=0 > > ---------------------------------------------------------------------- > > For information about J forums see https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.jsoftware.com%2Fforums.htm&data=02%7C01%7C%7C9e44f8b9de4d49a54aac08d66e7b98c7%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636817874454254828&sdata=MLxReCknfAxge%2BDeH0pIQHKY6WA7hSRd5998SEb3kJw%3D&reserved=0 > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > --- > This email has been checked for viruses by AVG. > https://www.avg.com > > ---------------------------------------------------------------------- > 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
