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2020-09-23 11:04:45 × DustyDingo quits (~nonamen@v2202001112302107134.ultrasrv.de) (Ping timeout: 240 seconds)
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2020-09-23 11:33:45 <sshine> hi siraben :)
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2020-09-23 11:46:04 <siraben> edwardk: thanks, i'll look into fromScope/toScope
2020-09-23 11:46:14 <siraben> hi sshine , what are you working on?
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2020-09-23 11:52:22 <AlexM84> greetings, a noob haskell question here. Doing some haskell learning for fun (cis194 course), building a binary search tree that is somewhat balanced and it turns out that it appears slower than not balanced one (which becomes a linked list really) when I'm trying to get an element by index. Obviously for balanced tree it is O(logN) and for not
2020-09-23 11:52:23 <AlexM84> balanced it's O(n) but because haskell rebuilds the tree every time the index function is applied it appears to be slower, cause building of that balanced tree is slower. Can someone explain how to force haskell not to rebuild a data structure every time it is accessed or maybe I'm doing something wrong here?
2020-09-23 11:52:50 <dminuoso> AlexM84: It's best to share your code for starters.
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2020-09-23 11:53:13 × heatsink quits (~heatsink@107.136.5.69) (Ping timeout: 260 seconds)
2020-09-23 11:53:20 <AlexM84> (+++) :: (Sized m, Monoid m) => JoinList m a -> JoinList m a -> JoinList m a(+++) Empty x = x(+++) x Empty = x (+++) l@(Single _ _) r@(Single _ _) = Append (tag l <> tag r) l r(+++) l r@Append{} = r +++ l(+++) l@(Append s xs ys) r | isPowerOf2 . getSize . size $ s = Append (tag l <> tag r) l r | otherwise = Append (tag xs <> tag subAppend) xs
2020-09-23 11:53:21 <AlexM84> subAppend where subAppend = ys +++ r
2020-09-23 11:53:32 × cosimone quits (~cosimone@2001:b07:ae5:db26:b248:7aff:feea:34b6) (Quit: Quit.)
2020-09-23 11:53:32 <dminuoso> Can you share it on a pasting website perhaps like gist?
2020-09-23 11:53:45 <dminuoso> Also, be sure to share your data definitions
2020-09-23 11:53:45 <AlexM84> oops, sure, sorry folks, give me a sec
2020-09-23 11:53:49 <AlexM84> yep
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2020-09-23 11:59:05 <AlexM84> here you go https://gist.github.com/alexmilshtein/9618faa55821a1beb46498b92d3b1c29
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2020-09-23 12:01:21 <AlexM84> if I create a list like so: let lst = L.foldl (+++) Empty $ map (Single (Size 1)) $ [1..100000] and let lstu = L.foldl (++++) Empty $ map (Single (Size 1)) $ [1..100000]
2020-09-23 12:01:43 <AlexM84> the second one is a lot faster when indexJ function is applied
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2020-09-23 12:03:20 <AlexM84> update the gist with Sized module
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2020-09-23 12:20:08 <lyxia> if you apply indexJ just once that makes sense since the first one does a lot of work to rebalance the tree. It only pays off once you use indexing a lot
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