It is unusual to make assignment an array with an internal datatype. But it was all driven by the needs of the parser (see Dictionary, Section II.E), and the J interpreter is built around the parser.
See file t.c, and search for ASGN, CASGN, and CGASGN. (The latter two in the value parts, instead of the 0 and 1 that I said.) On Sat, Mar 9, 2019 at 4:10 PM Henry Rich <henryhr...@gmail.com> wrote: > I never knew that. I was relying on the ID byte. > > I now use upper flag bits of the type to distinguish ASGN as > private/public, and to-name/to-noun. > > I needed to distinguish named private assignments in explicit > definitions, because I preallocate symbols for them in a symbol table > that I also preallocate, and point each reference to them to the > preallocated symbol to avoid the name search during execution. > > Henry Rich > > On 3/9/2019 6:59 PM, Roger Hui wrote: > > ASGN is an internal type; in the value part (the ravel) of a scalar with > > that type, there is a 0 or 1, indicating whether is local assignment (=.) > > or global assignment (=:). > > > > On Sat, Mar 9, 2019 at 2:52 PM Henry Rich <henryhr...@gmail.com> wrote: > > > >> Aaaghh, you caught me. That was one of the first changes I made when I > >> was learning the J Engine. I knew it would print wrong, but I didn't > >> know how to make it right, and I hoped no one would ever notice. > >> > >> I guess I have to go back and fix it, but I understand the system better > >> now, so maybe I can figure out how to do it properly. > >> > >> Henry Rich > >> > >> On 3/9/2019 2:05 PM, Joey K Tuttle wrote: > >>> jkt@set1:~$ /usr/local/lib/j64-801/bin/jconsole > >>> JVERSION > >>> Engine: j701/2011-01-10/11:25 > >>> Library: 8.01.028 > >>> Platform: Linux 64 > >>> Installer: j801 install > >>> InstallPath: /usr/local/lib/j64-801 > >>> +a=.'huh' > >>> |domain error > >>> | +a=.'huh' > >>> > >>> exit 0 > >>> > >>> jkt@set1:~$ ja > >>> JVERSION > >>> Engine: j807/j64nonavx/linux > >>> Release-c: commercial/2019-02-24T10:44:44 > >>> Library: 8.07.22 > >>> Platform: Linux 64 > >>> Installer: J807 install > >>> InstallPath: /usr/local/lib/j64-807 > >>> Contact: www.jsoftware.com > >>> +a=.'huh' > >>> |domain error > >>> | +a=:'huh' > >>> > >>> NB. Curious -- why is =. changed to =: for error reports in recent > >> versions? > >>> ---------------------------------------------------------------------- > >>> 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
