上标R平方成图例 [英] Superscript R squared for legend

问题描述

我想为我的图例写一个R平方项，但我不知道怎么做.有人可以帮我吗? 我的图例语法是:

I want to write a R-squared term for my legend but I do not know how. Could someone help me please? My legend syntax is:

legend(2,10, c("BW (MPE=3%, R-squared=0.77)", 
       "MY (MPE=5%, R-squared=0.80)", pch=c(2,3))

我想像我们通常在文本中那样将R平方表示为R2.

I would liek to express R-squared as R2 as we normally have in the text.

推荐答案

如果将bquote和as.expression结合使用，它将起作用:

It will work if you combine bquote and as.expression:

plot(1:10)
legend(2, 10, c(as.expression(bquote("BW (MPE = 3%," ~ R^2 ~ "= 0.77)")),
                as.expression(bquote("MY (MPE = 5%," ~ R^2 ~ "= 0.80)"))), 
       pch=c(2,3))

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