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Logs: liberachat/#haskell

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2021-07-13 21:59:51 → mjs2600 joins (~mjs2600@c-24-91-3-49.hsd1.vt.comcast.net)
2021-07-13 21:59:57 <hseg> so eg first unification unifies (α -> β) -> (φ α -> φ β) and (a -> b)
2021-07-13 22:00:19 <hseg> for this to happen, we must have a ~ (α -> β), b ~ (φ α -> φ β)
2021-07-13 22:00:31 <hseg> ( ~ is type equality)
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2021-07-13 22:01:38 <hseg> I then make a couple of bookkeeping renamings, to avoid having α, β, φ in the resulting type
2021-07-13 22:01:51 <hseg> (so read {} from left to right)
2021-07-13 22:02:43 <hseg> the multiline {} decompose the desired equality more and more, producing assignments for some of the variables
2021-07-13 22:05:14 <mariohesles> Say I want to implement a library for defining social relationships, so a function in this library might be something like getPaternalGrandfather :: Person -> Person; I want to have references to each `Person`s children and parents within a given value. What would be a "Haskell-y" way of doing this? I'm thinking of doing something like the following `data Person = P UID Name Sex Parents Children deriving (Eq, Show)`, where `type UID =
2021-07-13 22:05:14 <mariohesles> Int`, `type Name = String`, `data Sex = Female | Male deriving (Eq, Show), `type Parents = [UID]` and `type Children = [UID]`, but it feels wrong. I would have to have a database of all Persons and would have to refer to this database to do anything interesting. Is this bad?
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2021-07-13 22:08:38 <hololeap> is what bad? having a database or needing it to do anything interesting?
2021-07-13 22:08:51 <hololeap> those both sound like pretty reasonable things to me
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2021-07-13 22:09:45 <hololeap> it's a pretty simple schema that would fit well inside an SQL database, so it's not going to need the full expressiveness of haskell. there's nothing wrong with that.
2021-07-13 22:09:59 <hseg> mariohesles: you mean you feel the encoding should be closer to the relationship graph?
2021-07-13 22:10:30 <hseg> otoh, being closer to the graph is nicer conceptually, but as hololeap points out, it'll be harder to serialize
2021-07-13 22:10:57 <hseg> and grippingly, it can potentially entail retaining huge objects in memory
2021-07-13 22:12:47 <FixedPointDude> yeah the graphiest thing that jumps out to me is: an Ancestry is a tree of Person, and every Person contains an Ancestry
2021-07-13 22:13:03 <FixedPointDude> data Person = Person Ancestry
2021-07-13 22:13:04 <FixedPointDude> data Ancestry = Empty | Tree [Person]
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2021-07-13 22:13:47 <FixedPointDude> well the Empty is redundant
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2021-07-13 22:35:12 <dsal> mariohesles: modeling this is going to be ridiculously hard. Are you sure every person is only either Male or Female and only has one paternal grandfather?
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2021-07-13 22:50:25 <mariohesles> dsal for the purpose of the library, yes, assume that there are only two sexes and everyone has exactly two real parents
2021-07-13 22:50:49 <davean> mariohesles: haha, I worked with genetics lab data, parents are complicated.
2021-07-13 22:51:18 <mariohesles> hseg yes I do feel the encoding could be closer to the graph itself
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2021-07-13 22:52:36 <dsal> A person may have multiple arbitrary relationships with multiple people. It's going to be easiest to just do a plain graph and perhaps have common named edges, but there are people for whom their father and grandfather are the same person, or have multiple fathers to traverse for grandparents.
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