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hline/vline with subplots in Julia

I'm trying to add a horizontal line to a subplot, and from this discussion: https://discourse.julialang.org/t/vline-with-subplots/25479/2, I have the following

x = [1,2,3]
y1 = 2x
y2 = x.^2
plot([x, x], [y1, y2], layout = (2, 1))
hline!([4 4])

Which produces the plots.

plots

Now what I'm trying to do is do the horizontal line on the bottom plot, but not the top one. If I just specify hline!([4]) , it defaults to the top one. Is there a way to do the bottom one only?

Solution

  • It's probably best practice to plot subplots separately (as mentioned on Slack by isentropic):

    x = [1,2,3]
y1 = 2x
y2 = x.^2
p1 = plot(x, y1)
p2 = plot(x, y2)
hline!(p2, [4])
plot(p1, p2, layout = (2, 1))

    But if you want it all in one go, you could have used

    hline!([[NaN], [4]])