I am plotting a graph with a categorical variable on the x axis and a numerical variable on the y axis.
For the x axis, given that there are many data points, the default text formatting causes the label for each tick mark to overlap with other labels. How do I (a) change the font size for my axis text and (b) change the orientation of the text so that the text is perpendicular to the axis?
d <- data.frame(x=gl(10, 1, 10, labels=paste("long text label ", letters[1:10])), y=rnorm(10)) ggplot(d, aes(x=x, y=y)) + geom_point() + theme(text = element_text(size=20), axis.text.x = element_text(angle=90, vjust=1)) #vjust adjust the vertical justification of the labels, which is often useful
There's lots of good information about how to format your ggplots here. You can see a full list of parameters you can modify (basically, all of them) using