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Editorial Team
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Asked: 2026-06-18T19:00:01+00:00

I’m trying to annotate a plot with R² value and significance coding, but I

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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^{**"
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1 Answer

  1. Editorial Team

    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

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