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# helps
Slackbot
05/23/2023, 11:14 AMThis message was deleted.
a
Allison (Observable Team)
05/23/2023, 1:35 PMHi Dylan! Here’s an option to add a horizontal line at the median:
Copy code
Plot.plot({
marks: [
Plot.dot(penguins, { x: "flipper_length_mm", y: "body_mass_g" }),
Plot.ruleY([d3.median(penguins, (d) => d.body_mass_g)])
]
})Allison (Observable Team)
05/23/2023, 1:36 PMSo with your data, I think that Plot.ruleY line would be:
Plot.ruleY([d3.median(data, d => d.a8_avg)])💥 1
🙌 1
Allison (Observable Team)
05/23/2023, 1:54 PM(also I hope you feel better soon! 🍵)
👍 1
d
Dylan Omran
05/23/2023, 2:30 PM@Allison (Observable Team) thank you so much! Now that's out of the way I'm feeling a bit better 🙂
Dylan Omran
05/23/2023, 2:40 PM@Allison (Observable Team) I don't know if this is relevant to the Observable team but I've found that ChatGPT is really not much help at all for working in Observable. For D3 itself it's ok (still not perfect) but answers tend not to take into account the 'cellular' nature of Observable, or use the Plot library. At least in my experience. I don't suppose there's much you can do about that though.
m
Michael Cooper
05/23/2023, 5:05 PMNo, not really. We can't control what OpenAI releases or uses as training material. It's kind of like someone published a book with a bunch of wrong info about how to write notebooks
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m
Mike Bostock
05/23/2023, 6:52 PMI recommend the groupZ transform. To take Allison’s example:
Copy code
Plot.plot({
marks: [
Plot.dot(penguins, {x: "flipper_length_mm", y: "body_mass_g"}),
Plot.ruleY(penguins, Plot.groupZ({y: "median"}, {y: "body_mass_g"}))
]
})🌟 1
🎉 1
a
Allison (Observable Team)
05/23/2023, 6:58 PMoh way better, thanks Mike!
❤️ 1
d
Dylan Omran
05/23/2023, 8:51 PMWow, thanks @Mike Bostock! That's such a tidy way to do it.
🙏 1
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