It wasn't designed for Clojure originally, but I have an immutable "grid" persistent data structure in Java that I've used with some success in Clojure. It works nicely and efficiently with Clojure idioms because it is a proper persistent data structure (with a 64-way branching factor).
https://github.com/mikera/mikera/blob/master/src/main/java/mikera/engine/PersistentTreeGrid.java It's actually a 3D grid, but you can use just 2 dimensions and keep the 3rd set to zero. On Friday, 2 August 2013 01:59:40 UTC+1, JvJ wrote: > > I'm looking for an associative data structure that can be accessed by both > rows and columns, and could potentially be sparse. > > Suppose the following table is called t: > > | | :A | :B | :C ||---+------+------+----------|| 1 | | > | '[x y z] || 2 | "2a" | "2b" | || 3 | | | || 3 | > :3a | | "Foo" | > > > Then (t :A) would return {2 "2a", 3 :3a}, and (t 2) would return {:A "2a", > :B "2b"}. > (t :A 2) or (t 2 :A) would return "2a". > > I'm thinking of implementing it as a simple map of maps with some extra > functions, but I'm not sure if > that would be the best option. > > > -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
