如何在R上的图上包括文字的上标? [英] How do I include a superscript to texts on a plot on R?

问题描述

我需要它看起来像这样:

I need it to look like this:

R ^ 2 =一些值

R^2 = some values

我尝试了下面的代码，但是它不起作用，而是显示为"R(expression(^ 2))= some values":

And I've tried the code below but it wouldn't work, it came out as "R (expression (^2)) = some values" instead:

text (25, 200, paste ("R (expression (^2)) =", round (rsquarelm2, 2)))

推荐答案

您不需要字符向量，而是表达式，因此

You don't want a character vector, but an expression, hence this

expression(R^2 == 0.85)

是您所需要的.在这种情况下，您要替换另一个R运算的结果.为此，您需要substitute()或bquote().我发现后者更易于使用:

is what you need. In this case, you want to substitute in the result of another R operation. For that you want substitute() or bquote(). I find the latter easier to work with:

rsquarelm2 <- 0.855463
plot(1:10, 1:10, type = "n")
text(5, 5, bquote(R^2 == .(round(rsquarelm2, 2))))

对于bquote()，.( )中的所有内容都会被求值，结果将包含在返回的表达式中.

With bquote(), anything in .( ) is evaluated and the result is included in the expression returned.

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