A long tacit train of symbols can be difficult to parse especially when we don't know whether its usage is monad or dyad.
examples in J Phrases give hints like this, m1=: [ + + d1=: [ + + Ср, 25 ноя 2015, jprogramming написал(а): > > Also the primitives addon can not translate from symbols to namedverbs > > automatically because valency is unknown until actual > execution. > > That's what I remember, and the primitives addons workaround is to give 2 > names to each builtin verb, and IndexOf 5 is valid even if nonsensical. > > Your proposal is a completely reasonable alternative, but its less convenient > and requires more typing effort. > > Consider Conjugate > > 3 ([ + +) 3j4 > 9j4 > 3 ([ + +@]) 3j4 > 6j_4 > ([ + +) 3j4 > 6 > > all are valid ambivalently, but if you intended the 2nd and 3rd vs 1st and > 3rd then: > > > ([ + conjugate) captures that intent. (includes option of no whitespace) > > > with your proposal you would have to write either > > ([ + Conjugate@]) > > or > > (Right Plus Plus) NB. if 2nd meaning intended > > > but that 2nd one is only valid if you call it dyadically and it doesn't have > any of the 3 mentioned meanings: > > 0 ([ + +) 3j4 > 3j4 > 0 (] + +) 3j4 NB. required call to match original monad. > > so that is another advantage to leaving the dyad primitives alone. You can > still make ambivalent verbs, and the dyad case may be the main ambivalent > intent. > > > ----- Original Message ----- > From: bill lam <bbill....@gmail.com> > To: 'Pascal Jasmin' via Programming <programm...@jsoftware.com> > Sent: Wednesday, November 25, 2015 11:40 AM > Subject: Re: [Jprogramming] dyadic J > > I think ambivalent is difficult and not that intuitive for > uninitiated users. Perhaps J (and APL) needed ambivalent > partly because there were not enough symbols. Making named verbs > either monad or dyad but not both, might make life of new users > easier. eg. > > til =: i. : [: > til 5 > 0 1 2 3 4 > 1 til 5 > |domain error: til > | 1 til 5 > indexOf =: [: : i. > 1 2 3 indexOf 2 > 1 > indexOf 2 > |domain error: indexOf > | indexOf 2 > > Also the primitives addon can not translate from symbols to named > verbs automatically because valency is unknown until actual > execution. > > > -- > regards, > ==================================================== > GPG key 1024D/4434BAB3 2008-08-24 > gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3 > gpg --keyserver subkeys.pgp.net --armor --export 4434BAB3 > > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm -- regards, ==================================================== GPG key 1024D/4434BAB3 2008-08-24 gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3 gpg --keyserver subkeys.pgp.net --armor --export 4434BAB3 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
