How do I change the number of decimal places on axis labels in ggplot2?

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From the help for ?scale_y_continuous, the argument ‘labels’ can be a function:

labels One of:

  • NULL for no labels

  • waiver() for the default labels computed by the transformation object

  • A character vector giving labels (must be same length as breaks)

  • A function that takes the breaks as input and returns labels as output

We will use the last option, a function that takes breaks as an argument and returns a number with 2 decimal places.

#Our transformation function
scaleFUN <- function(x) sprintf("%.2f", x)

#Plot
library(ggplot2)
p <- ggplot(mpg, aes(displ, cty)) + geom_point()
p <- p + facet_grid(. ~ cyl)
p + scale_y_continuous(labels=scaleFUN)

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