The rank of Times is infinite (left, right and monad ranks). The rank of * is zero.
But I see that you're not actually using Times in your expressions. There, the issue is conjunction parsing. Conjunctions have a long left scope, and from your description you really intended: (i.3 4)+/ .(*@*) i.4 5 3 3 3 3 3 3 4 4 4 4 3 4 4 4 4 Thanks, -- Raul -- Raul On Fri, Mar 1, 2019 at 11:54 AM Brian Schott <schott.br...@gmail.com> wrote: > > Length error results when, instead of the usual Times in dot product, I > use Signum@Times or Signum@:Times. On the other hand, when I use the > equivalent of dot product u@(v"(1+lv,_)) no length error occurs. > > Below is a short session demonstrating my experiments. > What am I missing? > > Thanks, > > JVERSION > Engine: j807/j64/darwin > Release-c: commercial/2019-02-24T10:50:40 > Library: 8.07.22 > Platform: Darwin 64 > Installer: J807 install > InstallPath: /users/brian/j64-807 > Contact: www.jsoftware.com > (i. 3 4 ) +/ . * i. 4 5 > 70 76 82 88 94 > 190 212 234 256 278 > 310 348 386 424 462 > (i. 3 4 ) +/ . *@:* i. 4 5 > |length error > | (i.3 4) +/ .*@:*i.4 5 > (i. 3 4)+/@(*"(1+0,_)) i. 4 5 > 70 76 82 88 94 > 190 212 234 256 278 > 310 348 386 424 462 > (i. 3 4)+/@(*@*"(1+0,_)) i. 4 5 > 3 3 3 3 3 > 3 4 4 4 4 > 3 4 4 4 4 > > > > -- > (B=) > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
