Change a continuous axis' labels to be strings

Question

I am creating a line chart in ggplot2 with a continuous y-axis but I would like to change the labels to strings to represent bounds, is this possible?

For example, I want all values V<10 = A, 10>V<20 = B, and V>20 = C.

Y<-c(5,15,12,8,12,13,19,24) Day<-c(1,2,3,4,5,6,7,8) data <- data.frame(Y, Day) ggplot(data= data, aes(x=Day, y=Y, group=1))+geom_line()+geom_point()

The label of 10 would be replaced by A, 20 by B and so on.

Hi Olli, yes, it's possible, but your description of what you want isn't clear enough to allow for a demonstration. Could you edit your question to give a minimal reproducible example, including a sample of your data, your current code, and a clearer description of what you want your plot to look like? — Allan Cameron
– Allan Cameron, Commented Jul 12, 2020 at 20:34
It's easier to help you if you include a simple reproducible example with sample input and desired output that can be used to test and verify possible solutions. — MrFlick
– MrFlick, Commented Jul 12, 2020 at 22:04

chemdork123 · Accepted Answer · 2020-07-13 12:07:53Z

You can use scale_y_continuous and relabel the scale using the labels= argument. The key here is to also use breaks= which map back to the original numeric scale and then I'm also using limits= to ensure that we can see the whole alphabet.

ggplot(data= data, aes(x=Day, y=Y, group=1))+geom_line()+geom_point() + scale_y_continuous(labels=LETTERS, breaks=1:26, limits=c(1,26))

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