fstevens
fstevens

Reputation: 1297

How to add an asterisk symbol in a mathematical expression?

I'm trying to annotate a plot with R² value and significance coding, but I can't pass * as a symbol and not as the juxtaposition operator.

I've tried ?plot.math, here is what I tried

plot(1:10,1:10)
text(6,4,expression(R^2==8))
text(6,4,expression(R^2==8^{**}))
Error: unexpected '^' in "text(6,4,expression(R^2==8^{**"

Upvotes: 13

Views: 6784

Answers (1)

csgillespie
csgillespie

Reputation: 60492

You need to use paste inside your expression:

text(4,6,expression(paste(R^2==8^"**")))

or

text(6,4,expression(paste(R^2==8, "**")))

enter image description here

Upvotes: 14

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