There is an ς at the end of my name. Greek is only one case where you run into complication which is why you should specify characters in the order to be evaluated in the comparison. This needn’t be built in to J. It is very case specific.
In Arabic most letters have separate forms for initial, middle, and final positions. From Unicode to Typography, a Case Study the Greek Script https://www.researchgate.net/profile/Yannis_Haralambous/publication/2417759_From_Unicode_to_Typography_a_Case_Study_the_Greek_Script/links/540777ec0cf23d9765aa310a.pdf > On Dec 10, 2022, at 3:03 PM, Devon McCormick <[email protected]> wrote: > > Interestingly, Unicode has a character for a Greek letter that does not > exist as far as I know. > > ((,(<a.){~&>206,&.>177+i.15),,(<a.){~&>207,&.>128+i.10),:,(<a.){~&>206,&.>145+i.25 > αβγδεζηθικλμνξοπρςστυφχψω > ΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩ > > Notice the two forms of lowercase sigma: ς and σ. The former is used at > the end of a word only and I think it has something to do with why old > documents - like this one > https://www.awesomestories.com/images/user/2d7876098f.jpg > <https://www.awesomestories.com/images/user/2d7876098f.jpg> - seem to use a > funny character for "s" that looks kind of like an "f". In any case, the > uppercase row has an unprintable character preceding the Σ (sigma) which is > apparently the uppercase of the end-of-word sigma. > > > On Sat, Dec 10, 2022 at 2:48 PM Devon McCormick <[email protected] > <mailto:[email protected]>> wrote: > >> Raul's expression "<&(3&u:)" made me think of the endless complications >> for character comparison once you include multi-byte representations as in >> Unicode. >> So this initial expression works fine but extending it beyond elements of >> a. leads to ambiguity. >> 'A' <&(3&u:) 'a' >> 1 >> a. i. 'Aa' NB. confirming the inequality >> 65 97 >> NB. (load "define-abbrev-table.el") NB. This allows me to enter >> special characters in emacs >> 'α' <&(3&u:) 'a' >> 0 0 >> 'α' <&(3&u:) 'β' NB. So should we say alpha is only partially >> less than beta? >> 0 1 >> (<a.) i. &> 'α';'β' >> 206 177 >> 206 178 >> >> >> >> On Sat, Dec 10, 2022 at 7:28 AM 'Mike Day' via Chat <[email protected]> >> wrote: >> >>> Yes, my suggestion was an example of using /:~ to exploit J's inbuilt >>> ordering for a >>> simple, quick answer; but maybe >>> /:~ 'aA1.;' >>> (eg) isn't the order relation you require, so I agree with Raul. >>> >>> Mike >>> >>> Sent from my iPad >>> >>>> On 9 Dec 2022, at 19:22, Jimmy Gauvin <[email protected]> wrote: >>>> >>>> Hi, >>>> >>>> the domain of < and others could be extended to include characters. >>>> >>>> Sorting with /: and \: implies there is an "order" relation between >>>> characters. >>>> >>>> >>>> J >>>> >>>>> On Fri, Dec 9, 2022 at 6:21 AM Donna Ydreos <[email protected]> >>> wrote: >>>>> >>>>> The domain of < is numeric. You can create a function for letters with >>>>> reference to alphabetic order or some given order including say all >>> ASCI >>>>> characters. >>>>> >>>>>>> On Dec 9, 2022, at 3:47 AM, Jimmy Gauvin <[email protected]> >>> wrote: >>>>>> >>>>>> Hi all, >>>>>> >>>>>> testing character data for equality works fine but testing for >>> relative >>>>>> order does not. >>>>>> >>>>>> 'a'<'v' >>>>>> >>>>>> |domain error >>>>>> >>>>>> | 'a' <'v' >>>>>> >>>>>> 'a'='v' >>>>>> >>>>>> 0 >>>>>> >>>>>> Is this explained somewhere ? >>>>>> >>>>>> Thanks, >>>>>> >>>>>> Jimmy >>>>>> ---------------------------------------------------------------------- >>>>>> 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 >>> >> >> >> -- >> >> Devon McCormick, CFA >> >> Quantitative Consultant >> >> > > -- > > Devon McCormick, CFA > > Quantitative Consultant > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > <http://www.jsoftware.com/forums.htm> ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
