(0, 1) Thanks for your kind words. It does seem a very supportive and knowledgeable community.
(3) This makes sense now. Thanks too for pointing me to NuVoc. It seems an improvement in some respects, though it appears not to be distributed with J. (4) I particularly enjoy the terseness of the original Voc., and its availability offline. Perhaps a static copy of NuVoc could be distributed with J, and the original Voc. could include a warning about its obsolescence? I'd love to see J thrive in the future. It seems the case with all software, whether programming language or not, that documentation very important. J's is very good. This is the only shortcoming I can see. Matt On 3 Jan 2016 1:11 pm, "Henry Rich" <[email protected]> wrote: > 0. Welcome to J! > > 1. If you are able to get that far entirely on your own, my hat is off to > you. You're a J natural, and I think you'll enjoy the language. > > 2. Your analysis is brilliant, though not quite perfect. rv must mean, > not the right rank of v, but instead the rank of a result-cell of v. And > even then, the equivalence would not be exact, because of changes to > result-cells when they are assembled into the overall result of v. > > 3. The best resource for learning J is NuVoc. It fills in the gaps in > the Dictionary, corrects errors like this one, and has tutorial > information. For u@v, see > > http://code.jsoftware.com/wiki/Vocabulary/at > > 4. The Dictionary is not actively maintained. Don't expect an update. > But NuVoc is a Wiki, so do what you can to improve it! > > Henry Rich > > > > On 1/2/2016 8:59 PM, Matthew Baulch wrote: > >> The equivalence (from the voc. page for @) >> >> x u@v y ↔ u x v y >> >> only seems to apply in some cases. For instance, with >> >> x =: 1 2 3 4 >> y =: 5 6 7 8 >> u =: */ >> v =: + >> >> this is most certainly false. After exploring a number of cases, >> it seems likely that >> >> x u@v y ↔ u"rv x v y >> >> where rv is the right rank of v. Is this true in all cases? >> If so, I'd be grateful if the dictionary could be updated accordingly. >> >> Matt Baulch >> ---------------------------------------------------------------------- >> 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
