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Using base graphics in R, how can I add superscripts to axis labels, as one might want to when plotting latitude and longitude axes on a map.
Consider this example:
plot(-100:-50, 50:100, type="n", xlab="", ylab="", axes=FALSE)
axis(1, seq(-100, -50, 10), labels=paste(abs(seq(-100, -50, 10)), "o", "W", sep=""))
axis(2, seq(50, 100, 10), labels=paste(seq(50,100,10), "o", "N", sep=""))
box()
Produces a nice frame around a map. It would be even nicer to make the degree symbol superscript.
This can usually be done in other plotting functions such as mtext() and text() using expression(paste(...)) or substitute() but how to do it in this case?
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Superscript is “started” by the caret ^ character. Anything after ^ is superscript. The superscript continues until you use a * or ~ character. If you want more text as superscript, then enclose it in quotes.
Right-click on the highlighted text and go to “Format axis title”. 5. Select the “Font” tab. To make characters into superscripts or subscripts, check the appropriate box in the lower left portion of the dialogue box.
Key ggplot2 R functionsp + xlab(“New X axis label”): Change the X axis label. p + ylab(“New Y axis label”): Change the Y axis label. p + labs(x = “New X axis label”, y = “New Y axis label”): Change both x and y axis labels.
It works the same way for axes: parse(text='70^o*N') will raise the o as a superscript (the *N is to make sure the N doesn't get raised too).
labelsX=parse(text=paste(abs(seq(-100, -50, 10)), "^o ", "*W", sep=""))
labelsY=parse(text=paste(seq(50,100,10), "^o ", "*N", sep=""))
plot(-100:-50, 50:100, type="n", xlab="", ylab="", axes=FALSE)
axis(1, seq(-100, -50, 10), labels=labelsX)
axis(2, seq(50, 100, 10), labels=labelsY)
box()
This is a quick example
plot(rnorm(30), xlab = expression(paste("4"^"th")))
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