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Logs: liberachat/#haskell

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2021-06-04 03:08:39 <altern> Axman6, if `fmap value detectionType` will work for RoseTrees, how to make it work for [RoseTree]?
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2021-06-04 03:10:34 <Axman6> that's up to you, it depends on what value you want
2021-06-04 03:10:35 <altern> (I am having problem applying `fmap value detectionType` to xs's in `findBiggest detectionType (RoseTree node (x:xs)) = let searchInList = findBiggest (fmap value detectionType) xs`
2021-06-04 03:10:56 <Axman6> this comes down to the semantics you want
2021-06-04 03:11:56 <hololeap> altern: just want to throw it out there that there is a ready-made rose-tree implementation in Data.Tree
2021-06-04 03:13:25 <altern> hololeap, I know that. I have chosen not to go with it long time ago. Do not remember why :) probably some limitations similar to inability to define toJSON
2021-06-04 03:14:31 <hololeap> ok, that's fine. I just wanted to make sure you were aware
2021-06-04 03:14:47 <altern> thanks
2021-06-04 03:14:55 <altern> I appreciate it
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2021-06-04 03:19:54 <edwardk> Axman6: it mostly helps with the integer ones. the hashtable is used for the grouping of integer keys
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2021-06-04 03:20:38 <edwardk> you can bolt in a Hashable-using step into the mix to group things that have big complicated hash functions that may be precomputed for prefiltering grouping results though
2021-06-04 03:20:46 <edwardk> there's a combinator for it in there
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2021-06-04 03:23:30 <altern> Axman6, cannot figure out how to apply detectionType to lists..
2021-06-04 03:23:55 <dy> Would you say you... can't detect how :^)?
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2021-06-04 03:28:58 <hololeap> altern: data DetectionType a = One | Two | FactorOf a | DivisibleBy a -- What do you mean you want to apply this to lists? [DectectionType a] ? DetectionType [a] ?
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2021-06-04 03:31:41 <altern> hololeap, (I am having problem applying `fmap value detectionType` to xs's in `findBiggest detectionType (RoseTree node (x:xs)) = let searchInList = findBiggest (fmap value detectionType) xs
2021-06-04 03:32:23 <altern> hololeap, this is the original SO question: https://stackoverflow.com/questions/67829409/how-to-specify-typecllass-function-type-to-operate-on-rosetree-nodes
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2021-06-04 03:34:12 <altern> hololeap, sorry for double posting, you already found the q
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2021-06-04 03:35:44 <hololeap> if you're trying to fmap over a functor of functors, such as over [RoseTree a], you have to double nest fmaps like this: fmap (fmap value) detectionType
2021-06-04 03:36:07 <altern> ah,ok. that might work
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2021-06-04 03:37:24 <hololeap> although `value` doesn't sound like a function, but I can't see your code, other than what you posted
2021-06-04 03:37:45 <altern> data RoseTree a = RoseTree { value :: a, children :: [RoseTree a]}
2021-06-04 03:37:45 <altern> deriving (Show, Functor)
2021-06-04 03:37:55 <altern> this is where it is from
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2021-06-04 03:38:27 <hololeap> oh, so `value :: RoseTree -> a`
2021-06-04 03:38:54 <hololeap> and `fmap value :: Functor f => f RoseTree -> f a
2021-06-04 03:38:55 <altern> yep
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2021-06-04 03:40:41 <hololeap> it sounds like you are trying to look at every value in your tree and return the largest value, is that correct? if so, you want to use a fold, not fmap
2021-06-04 03:41:04 <altern> that's correct
2021-06-04 03:41:30 × lavaman quits (~lavaman@98.38.249.169) (Ping timeout: 272 seconds)
2021-06-04 03:41:40 <altern> I want to find biggest that satisfies the condition
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2021-06-04 03:55:15 <dmwit> altern: Yikes, that question is in serious need of minimization.
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2021-06-04 03:55:37 <dmwit> (That's probably why you're gathering downvotes.)
2021-06-04 03:55:59 <altern> :((
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2021-06-04 03:57:59 <altern> I am off to sleep. It's 7am at my side and I haven't slept all night. Feel free to post answers to the SO question
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2021-06-04 04:04:21 <hololeap> altern, if you haven't gone to sleep yet, here is how I would do it: http://sprunge.us/uj5wNs
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