Maybe you want
Data.Map.partition (\key -> key >= key1 && key <= key2) map
HTH,
Anish
On Sun, 08 Feb 2009 23:02:37 -0800, Jared Updike <[email protected]> wrote:
It looks like two "Map.split"s will do what I need except for allowing
more exact testing of <= vs. < (since == elements are left out of both
maps...?)
Jared.
On 2/8/09, Jared Updike <[email protected]> wrote:
I would like to enumerate a subset of keys in a Map satisfying \ key
>= key1 && key <= key2 but in the expected, reasonable amount of time
(e.g. < O(log(n)) + O(m) for n total keys and m keys in the subset).
(Or key > key1 and/or key < key2 or some such combination).
Is there an appropriate idiom or combination of library functions to
accomplish this, short of digging into the code for Data.Map and
writing such a function for a forked version of Data.Map?
For example I could try something like a Set.split of a Set.split of
Map.keysSet of my original map, but will laziness magically do what I
really want? which is to walk down the tree to key1 (or the nearest
key > key1) and enumerate keys in order until key2 is reached?
Data.Map almost looks like what I need if I can do this.
Jared.
_______________________________________________
Haskell-Cafe mailing list
[email protected]
http://www.haskell.org/mailman/listinfo/haskell-cafe
_______________________________________________
Haskell-Cafe mailing list
[email protected]
http://www.haskell.org/mailman/listinfo/haskell-cafe
