图轴标题上的特殊字符和上标 [英] Special characters and superscripts on plot axis titles

问题描述

我正在尝试使用特殊字符和上标制作 y 轴标题.我能够做到这一点，但我希望右括号不要被上标.这就是我遇到的问题.我认为这只是我的括号的放置，但我已经尝试了(似乎)一切.

I am trying to make a y-axis title with both a special character and a superscript. I am able to do this, but I want the closing parentheses not to be superscripted. And that's what I'm having a problem with. I think its just a placing of my parenthesis, but I've tried (seemingly) everything.

plot(WatexCl, ConcuM, col = as.numeric(1), pch = as.numeric(Depth), 
   xlab = expression(paste("Concentration Cl  ( ", mu, "moles/g dry wt)")), 
   ylab = expression(paste("Average Conc of S- on plates ( ", mu, "Moles/cm"^"2"),)), 
   data = plates)

推荐答案

用户经常无法掌握的一件事是，在使用时总是不需要引用字符串并将它们粘贴在一起在绘图标签的表达式中.直接使用布局工具通常更简单(例如 ~ 和 *).例如:

The one thing that often users fail to grasp is that you invariably don't need to quote strings and paste them together when used in an expression for a plot label. It is usually simpler to use the layout tools directly (e.g. ~ and *). For example:

df <- data.frame(y = rnorm(100), x = rnorm(100))

plot(y ~ x, data = df,
     ylab = expression(Average ~ Conc ~ of ~ S- ~ on ~ plates ~ 
                       (mu ~ Moles ~ cm^{-2} ~ dry ~ wt)),
     xlab = expression(Concentration ~ Cl ~ (mu ~ moles ~ g^{-1} ~ dry ~ wt)))

或者，您可以为更长的文本部分包含字符串；在这种情况下，可以说更容易做到:

Alternatively, you can include strings for longer sections of text; in this case it is arguably easier to do:

plot(y ~ x, data = df,
     ylab = expression("Average Conc of S- on plates" ~
                         (mu ~ moles ~ cm^{-2} ~ "dry wt")),
     xlab = expression("Concentration Cl" ~ (mu ~ moles ~ g^{-1} ~ "dry wt")))

但请注意，此处无需粘贴字符串和其他功能.

but note there is no need to paste strings and other features here.

两者都产生:

注意 plotmath 与上标 2 的问题.您可能希望为 y 轴边距添加一些额外的空间以适应:

Note the issue plotmath has with the superscript 2. You may wish to add some extra space for the y-axis margin to accommodate that:

op <- par(mar = c(5,4.5,4,2) + 0.1)
plot(y ~ x, data = df,
     ylab = expression("Average Conc of S- on plates" ~
                          (mu ~ moles ~ cm^{-2} ~ "dry wt")),
     xlab = expression("Concentration Cl" ~ (mu ~ moles ~ g^{-1} ~ "dry wt")))
par(op)

制作

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