the wikipage mislabels the / operator as map as well (it is in fact a reduce operator)
The functional map function replaces a "for each" loop. Rank is very closely tied to this, with the addition of specifying the size/slice/scope of the "each element" group On Wednesday, September 5, 2018, 1:56:33 p.m. EDT, Cliff Reiter <[email protected]> wrote: From Mathematica help: Map (Built-in Symbol) Map[f, expr] or f /@ expr applies f to each element on the first level in expr. Map[f, expr, levelspec] applies f to parts of expr specified by levelspec. Map[f] represents\[Ellipsis] On 9/5/2018 10:58 AM, devonmcc wrote: > I am trying to bring the Wikipedia page on "rank (J programming language)" > into compliance with the guidelines by inserting more inline references but > am stumped by that page's initial assertion that rank is a generalization of > looping, as well as the subsequent claims about rank generalizing "map" and > "maplist". > Searches for a word like "rank" bring up many irrelevant hits even when > included with programming-specific terms. Also, the best reference I have > found so far - www.ccs.neu.edu/home/jrslepak/typed-j.pdf - uses language like > "...a form of rank...which renders much of a program's control structure > implicit by lifting base operators to higher-dimensional array structures." > I will have to include this in the references to use it but was hoping to > find an older document, preferably one already in the references, but have > been stymied by the lack of explicit reference to avoiding loops by using > rank because it seems so obvious that it is only implied. > In any case, a reference to the assertions about "map" and such would also be > appreciated. > Thanks, > Devon > Sent from my Verizon, Samsung Galaxy smartphone > ---------------------------------------------------------------------- > 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
