R:在情节图例中使用表达式 [英] R: using expression in plot legends

问题描述

我正在尝试在 R 中使用 legend 函数.我希望标签读取 $\alpha = 1, \beta = 2$，所以我尝试使用

I'm trying to use the legend function in R. I want the label to read $\alpha = 1, \beta = 2$, so I tried using

legend("topleft", c(expression(alpha = 1, beta = 2)))

但这并没有奏效.有什么建议吗?

But that did not do the trick. Any advice?

如果我想让我的标签读取 $Gamma(\alpha = 1, \beta = 2)$ 怎么办?我试过了

What if I wanted my label to read $Gamma(\alpha = 1, \beta = 2)$? I tried

legend("topleft", c(paste("Gamma( ", expression(alpha = 1, beta = 2))))

推荐答案

我们可以把所有东西都放在表达式本身

We can place everything within the expression itself

plot(1)
legend("topleft", expression(alpha~"= 1, "~beta~" = 2"))

如果我们需要Gamma(

legend("topleft", expression(Gamma*"("*alpha~"= 1, "~beta~" = 2)"))

如果我们需要Gamma

legend("topleft", expression("Gamma("*alpha~"= 1, "~beta~" = 2)"))

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