Add superscript to lattice graph labels R

Question

I need to add superscript to my R lattice graph labels, specifically with "m^2".

equivalence.xyplot(mydata$IsoCanopyArea ~ mydata$ControlCanopyArea,
                   alpha=0.05, b0.ii=0.25, b1.ii=0.25,
                   xlab= "ISODATA (m^2)",
                   ylab= "Measured (m^2)")

This function uses lattice graphics, so the typical commands do not seem to work:

plot(0, ylab = ~ "AddTextHere" (m^2))

I have looked at several examples on this site with no success: example1 and example2 (Note I am a different Aaron than the OP in example2)

How can accomplish superscripts in lattice graph labels?

Typically axis labels should be supplied as characters, expressions or something else that can be converted to a character or an expression. However, `~"AddTextHere" (m^2))` creates an object of class `formula`. My guess is that the standard `plot` function automatically converts it to an expression, but `xyplot` does not and just ignore it. — Backlin, Oct 23 '12 at 15:10

score 4 · Accepted Answer · answered Oct 23 '12 at 15:08

4

Use expression as in:

plot(...
    xlab=expression("ISODATA " (m^2))
    ylab= expression("Measured" (m^2))
....)

answered Oct 23 '12 at 15:08

Jilber Urbina

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score 1 · Answer 2 · answered Oct 23 '12 at 16:32

Based on the solution from @Jilber, the following changes to the graph worked:

equivalence.xyplot(mydata$IsoCanopyArea ~ mydata$ControlCanopyArea,
                   alpha=0.05, b0.ii=0.25, b1.ii=0.25,
                   xlab= expression("ISODATA " (m^2)),
                   ylab= expression("Measured " (m^2)))

enter image description here

Add superscript to lattice graph labels R

2 Answers2