R: adding horizontal lines to ggplot2

Question

I am using the ggplot2 library in R.

Suppose I have a graph that looks like this:

library(ggplot2)

ggplot(work) + geom_line(aes(x = var1, y = var2, group = 1)) +
               theme(axis.text.x = element_text(angle = 90)) +
               ggtitle("sample graph")

Is there a way to directly add a second line to this graph?

e.g.

ggplot(work) + geom_line(aes(x = var1, y = var2, group = 1)) +
               geom_line(aes(x = var1, y = mean(var2), group = 1)) +
               theme(axis.text.x = element_text(angle = 90)) +
               ggtitle("Sample graph")

Thanks

It would be easier to help if you create a small reproducible example along with expected output. Read about how to give a reproducible example. — Ronak Shah
– Ronak Shah, Commented May 13, 2021 at 5:11
A few typos in your code : forgotten ) - it seems to work with edits above. As suggested by @Ronak Shah, please supply MRE if it still doesn't work as you'd like — Waldi
– Waldi, Commented May 13, 2021 at 5:39

bird · Accepted Answer · 2021-05-13 13:13:08Z

14

Indeed it is possible:

library(ggplot2)
ggplot(mtcars, aes(x = mpg)) +
        geom_line(aes(y = hp), col = "red") +
        geom_line(aes(y = mean(hp)), col = "blue")

However, for specifically horizontal lines, I would use geom_hline intstead:

ggplot(mtcars, aes(x = mpg, y = hp)) +
        geom_line(col = "blue") +
        geom_hline(yintercept = mean(mtcars$hp), col = "red")

edited May 13, 2021 at 13:13

answered May 13, 2021 at 6:01

bird

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