[Haskell-cafe] What is Data.Vec.DataFamily.SpineStrict.Pigeonhole and why is it following me?

[David Feuer]

No, this seems to have nothing to do with the pigeonhole principle. It
seems to be about the sizes of length-indexed vectors. The "pigeonhole
size" is just the vector length, available at the type level. This all
seems to be about matching up vectors to representable functors. So it
would match up

    data Foo a = Foo a a a a

to the type of vectors of length 4, giving functions to convert between
them. I'm ... not exactly sure what purpose this serves.

On Sun, Nov 28, 2021, 11:07 PM Galaxy Being <borgauf at gmail.com> wrote:

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> https://hackage.haskell.org/package/vec-0.4/docs/Data-Vec-DataFamily-SpineStrict-Pigeonhole.html
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>    in Hackage is something a rank amateur like me can't fathom. I just hit
> a
>    chapter in a book that dives into the Pigeonhole Principle. Is this the
> "accompanying
>    Haskell Wundercode" for the math world's PHP? I know PHP is a big deal
> in
>    math. I don't see an "author," and I see no documentation. Anyone know
> how
>    I can figure this mystery out, like at least find the author or someone
> that
>    knows something about this? [...]
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> ---------- Forwarded message ----------
> From: Galaxy Being <borgauf at gmail.com>
> To: haskell-cafe <haskell-cafe at haskell.org>
> Cc:
> Bcc:
> Date: Sun, 28 Nov 2021 22:05:44 -0600
> Subject: What is Data.Vec.DataFamily.SpineStrict.Pigeonhole and why is it
> following me?
> This
> <https://hackage.haskell.org/package/vec-0.4/docs/Data-Vec-DataFamily-SpineStrict-Pigeonhole.html>
> in Hackage is something a rank amateur like me can't fathom. I just hit a
> chapter in a book that dives into the Pigeonhole Principle. Is this the
> "accompanying Haskell Wundercode" for the math world's PHP? I know PHP is a
> big deal in math. I don't see an "author," and I see no documentation.
> Anyone know how I can figure this mystery out, like at least find the
> author or someone that knows something about this?
>
> --
> ⨽
> Lawrence Bottorff
> Grand Marais, MN, USA
> borgauf at gmail.com
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