Wrap long axis labels via labeller=label_wrap in ggplot2

axis-labels, ggplot2, plot, r

Solution

You don't need the `label_wrap` function. Instead use the `str_wrap` function from the `stringr` package.

You do not provide your `df` data frame, so I create a simple data frame, one that contains your labels. Then, apply the `str_wrap` function to the labels.

library(ggplot2)
library(stringr)

df = data.frame(x = c("label", "long label", "very, very long label"), 
                y = c(10, 15, 20))
df

df$newx = str_wrap(df$x, width = 10)
df

Now to apply the labels to a ggplot chart: The first chart uses the original labels; the second chart uses the modified labels; and for the third chart, the labels are modified in the call to ggplot.

ggplot(df, aes(x, y)) + 
  xlab("") + ylab("Number of Participants") +
  geom_bar(stat = "identity") 

ggplot(df, aes(newx, y)) + 
  xlab("") + ylab("Number of Participants") +
  geom_bar(stat = "identity")

ggplot(df, aes(x, y)) + 
  xlab("") + ylab("Number of Participants") +
  geom_bar(stat = "identity") +
  scale_x_discrete(labels = function(x) str_wrap(x, width = 10))

Problem

I would like to automatically wrap my labels in ggplot2, i.e. insert line breaks of long labels. Here is written how to write a function (1) for it, but sadly I do not know where to put `labeller=label_wrap` in my code (2). (1) function by hadley ``` label_wrap <- function(variable, value) { lapply(strwrap(as.character(value), width=25, simplify=FALSE), paste, collapse="\n") } ``` (2) code example ``` df = data.frame(x = c("label", "long label", "very, very long label"), y = c(10, 15, 20)) ggplot(df, aes(x, y)) + geom_bar(stat="identity") ``` I'd like to wrap some of the longer labels here.

Original source