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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) 
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The expression() command used to make superscripts and subscripts in axis labels. Note that R does not “like” subscripts beginning with numbers and continuing with letters! So [2xyz] gives an error but [2 * xyz] is fine.
Subscripts and SuperscriptsTo indicate a subscript, use the underscore _ character. To indicate a superscript, use a single caret character ^ . Note: this can be confusing, because the R Markdown language delimits superscripts with two carets.
To set labels for X and Y axes in R plot, call plot() function and along with the data to be plot, pass required string values for the X and Y axes labels to the “xlab” and “ylab” parameters respectively. By default X-axis label is set to “x”, and Y-axis label is set to “y”.
Make Axis Title Text Bold Font with element_text() To make both x and y-axis's title text in bold font, we will use axis. title argument to theme() function with element_text(face=”bold”). Note now both x and y axis's title text are in bold font.
Use superscripts in R axis labels 3 Strings & Expressions in Plot Titles, Labels etc 3 R: Generate plot axis break labels with superscripts programmatically 1 Aligning awkward plot and axis titles 1 Superscript, subscript, and greek symbol all in one axis title in ggplot2 2
As you can see, the main title of the plot contains a superscript. Note that you may add a superscript to any other kind of text (e.g. axis labels or text within a graph) in a Base R graphic.
Display a superscript in the title using the ^ character. The ^ character modifies the character immediately following it. Include multiple characters in the superscript by enclosing them in curly braces {}. Include the Greek letters and in the text using the TeX markups \alpha and \mu, respectively. Add text at the data point where t = 300.
Figure 2: R Plot with Subscript in Main Title. As you can see in Figure 2, our plot title contains a subscript. It is also possible to add several superscripts and subscripts to a text element using the expression function and the symbols ^ and [] as shown in the previous examples.
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))) 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"))) but note there is no need to paste strings and other features here.
Both produce:
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) producing
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