绘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

我正在尝试制作一个带有特殊字符和上标的y轴标题.我能够做到这一点，但我希望不要在右括号上加上上标.这就是我遇到的问题.我认为这只是放置括号的地方，但是我已经(似乎)尝试了所有操作.

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

用户经常无法理解的一件事是，当在表达式中使用字符串时，您总是不需要将字符串加引号并将paste一起使用情节标签.直接使用布局工具(例如~和*)通常更简单.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，您可以包含用于较长文本段的字符串；在这种情况下，可以说很容易做到:

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")))

但是请注意，这里不需要paste字符串和其他功能.

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

两种产品:

请注意plotmath带有上标2的问题.您可能希望为y轴边距添加一些额外的空间，以适应以下情况:

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)

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