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I have a really simple question, which I am struggling to find the answer to. I hoped someone here might be able to help me.

An example dataframe is presented below:

a <- c(1:10)
b <- c(10:1)
df <- data.frame(a,b)
library(ggplot2)
g = ggplot(data=df) + geom_point(aes(x=a, y=b)) +
  xlab("x axis")
g

I just want to learn how I change the text size of the axes titles and the axes labels.

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You can change axis text and label size with arguments axis.text= and axis.title= in function theme(). If you need, for example, change only x axis title size, then use axis.title.x=.

g+theme(axis.text=element_text(size=12),
        axis.title=element_text(size=14,face="bold"))

There is good examples about setting of different theme() parameters in ggplot2 page.


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