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2020-11-13 16:47:43 <ski> > do n <- [1 .. 9]; d <- [2 .. n-1]; guard (n `mod` d == 0); return (n,d)
2020-11-13 16:47:45 <lambdabot> [(4,2),(6,2),(6,3),(8,2),(8,4),(9,3)]
2020-11-13 16:48:09 <motte> hekkaidekapus: the list i was talking about was more like replicate 9 [1..4]
2020-11-13 16:48:26 <ski> (it computes composite numbers less than ten, paired with possible proper divisors)
2020-11-13 16:49:45 <motte> hekkaidekapus: so main = print $ length $ traverse permutations $ replicate 9 [1..4] , which quickly eats all my ram, even with -O2
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2020-11-13 17:02:00 hackage beam-automigrate 0.1.0.0 - DB migration library for beam, targeting Postgres. https://hackage.haskell.org/package/beam-automigrate-0.1.0.0 (abrar)
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2020-11-13 17:41:30 hackage stack-all 0.1 - CLI tool for building across Stackage major versions https://hackage.haskell.org/package/stack-all-0.1 (JensPetersen)
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2020-11-13 17:55:11 <kwantuM> hey, I was wondering if someone could explain what the (I# x#) syntax means. I was looking at the data.bits source
2020-11-13 17:55:44 <glguy> kwantuM: in that context # is just another letter
2020-11-13 17:56:11 <glguy> I# is a constructor and x# is a variable there.
2020-11-13 17:56:31 <glguy> The convention is that unboxed things have a # in their names
2020-11-13 17:56:31 <kwantuM> so why is the # used?
2020-11-13 17:56:38 <kwantuM> oh okay, thanks!
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2020-11-13 18:01:55 <hekkaidekapus> motte: Yeah, that will blow up quickly. The oneliner we are using is useful for short lists. Perhaps approach your problem from another perspective. Define a list (a set, really) and build up permutations σ₁, σ₂, σ₃… based only on indices. Then work on those σs to pick elements from the set as you like.
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2020-11-13 18:22:01 hackage telegram-bot-simple 0.3.4 - Easy to use library for building Telegram bots. https://hackage.haskell.org/package/telegram-bot-simple-0.3.4 (swamp_agr)
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