How To Add Superscript In Ggplot Axis

Centrality labels

If we want to change the axis labels themselves, this is done using the labs() command.

          iris.scatter <- iris.scatter + labs(x = "Sepal Length (cm)", y = "Petal Length (cm)")  iris.scatter

If we wish to add a title to our plot (non overly common in publications) we tin can utilise the following.

          iris.scatter <- iris.scatter + labs(championship= "Relationship betwixt petal and sepal length")   iris.scatter

Later on trying to utilize these labs() commands you volition start to realise it hates anything slightly symbolic (subscript, superscript, degrees etc.). To gear up this is simple, just clumsy in how its executed. The following lawmaking uses the expression() argument to solve these issues.
I have written a 10-axis label that does non make sense, in an try to display the nigh mutual issues. These are a few of my own, and then they exercise not make whatsoever sense with the given graph.

          iris.besprinkle <- ggplot(iris, aes(x=Sepal.Length, y=Petal.Length, colour=Species)) +   geom_point() +   labs(ten = expression(Sepal~Length[cm]), y = expression(Petal~Length^cm))+   labs(title = expression(Sepal~by~Petal~at~"20"*degree*C)) iris.scatter

This example, while nonsensical, demonstrates some of the major quirks with the expression() argument/control.
Across all of the expression arguments, we specify a space between characters/words past using a tilde ~. In our x centrality, we specify a subscript (lower) by using square brackets []. Anything inside these will be placed below the preceeding graphic symbol. Similarly, we specify superscript by using the caret ^ to denote power. Annihilation placed afterward will be placed above the preceeding character.

In the title line, (note that I had to place the title on a split line…ggplot is precious sometimes) we see quotations around the 20. This is because expression does not appreciate anything starting with a number. The side by side affair is the apply of both "degree" and the asterix __*__. The asterix is used when we need to write something like "degree" or "pi" to specify a symbol, but when we want it to exist adjacent to something, similar a C for degree*C.

I hope this helps sympathise the clumsy execution of circuitous axis labels.