如何在数学表达式中添加星号? [英] How to add an asterisk symbol in a mathematical expression?

问题描述

我试图用 R² 值和显着性编码来注释一个图，但我不能将 * 作为符号传递，而不是作为并列运算符传递.

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.

我试过 ?plot.math，这是我试过的

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^{**"

推荐答案

你需要在你的表达式中使用paste:

You need to use paste inside your expression:

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

或

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

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