Thanks for pointing out that Dic explains it better than Voc. I accept unreservedly that there is no shortage of documentation on Rank, and that it is adequately explained somewhere. But let's ask: is the delivery of this material effective?
...No, I can't answer that. It takes an articulate J newcomer. On Thu, Jun 9, 2011 at 3:57 AM, bill lam <[email protected]> wrote: > I guess Kent was confused partly because the introduction or the page on > rank in DOJ tells only half of the story, the cell. It does not mention > frame or how to assemble the result. The complete story is given in > DOJ part B. Verbs - dictionary/dictb.htm > > pay attention to the paragraph starting with, > The shape of a result is the frame .... > > The same detail with illustration diagrams should also available in > Henry's JforC, or Sharp APL reference manual, if my memory still serves me > well. > > Чтв, 09 Июн 2011, Ian Clark писал(а): >> Thank you, Kent, for posing a newbie question that crystallises the >> essence of Rank ("). And thanks to those who've offered an answer. >> >> I was just about to supply the content for the NuVoc entry on Rank: >> http://www.jsoftware.com/jwiki/Vocabulary/quote >> Your micro-example spotlights exactly what a novice needs to be told >> about it. I shall use it. >> >> >> >> On Wed, Jun 8, 2011 at 10:47 PM, Henry Rich <[email protected]> wrote: >> > You almost had it. I've fixed the error below. >> > >> > Henry Rich >> > >> > On 6/8/2011 5:41 PM, Squint6 wrote: >> >> >> >> Hi, >> >> >> >> >> >> I have just started with J and I have a question concerning rank (I >> >> think). >> >> >> >> >> >> I don't understand why the following does what it does: >> >> >> >> >> >> a=. 2 2 $ i.4 >> >> >> >> >> >> b=.+/a >> >> >> >> >> >> c=.+/"1 a >> >> >> >> >> >> After executing these lines >> >> a contains >> >> 0 1 >> >> 2 3 >> >> b contains 2 4 and >> >> c contains 1 5 >> >> >> >> >> >> I understand where b is coming from but c's value confuses me. Here's >> >> how my (faulty) reasoning about c=.+/"1 a goes. >> > >> >> The "1 applies to the verb (+/) giving it a rank of 1. Therefore (+/) is >> >> applied to the 1-cells of a, >> > >> >> which I believe are the lists (0 1) and (2 3). >> > ERROR FIXED HERE: >> >>Therefore we have (+/ 0 1) , (+/ 2 3) >> >> >> >> >> >> Thanks. >> >> Kent >> >> >> >> >> >> >> >> ---------------------------------------------------------------------- >> >> 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 > > -- > regards, > ==================================================== > GPG key 1024D/4434BAB3 2008-08-24 > gpg --keyserver subkeys.pgp.net --recv-keys 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
