how to use expression in in names.arg function

r expression plotmath
user3170629 picture user3170629 · Feb 10, 2014 · Viewed 8.5k times · Source

I have several carbon compounds in my bar graph but I need to subscript the numbers associated with each one, e.g. C*12*-C*16*, C*17*-C*25*,C*26*-C*32*,C*33*-C*37*.

I am trying to use the expression function but it is not going well with the names.arg function on barplot. Please see the code so far:

barplot(t(as.matrix(alkane)),
  ylim=c(0,100),
  names.arg=c("C12-C16","C17-C25","C26-C32","C33-C37"),
  xlab="Hydrocarbons analysed after 21 days",
  ylab="% loss in concentration relative to day 0",
  cex.lab=0.8,
  cex.axis=0.8,
  cex.names=0.8,
  cex.main=0.8,
  beside=TRUE,
  col=c("blue","red"))

Any help would be really appreciated.

Answer

llrs picture llrs · Feb 10, 2014

As you can see with the highlighting it is not properly formatted your names.arg, check the " to be paired:

names.arg=c("C12-C16","C17-C25","C26-C32","C33-C37"),

Related questions

Concatenate strings and expressions in a plot's title

How can I combine text and math expressions in a plot's title. If I use paste the expression is converted to character. For example I want something like this as a title $ARL_1$ curve for $S^2$ Thank you

Read More
Use expression with a variable r

I am trying to label a plot with the following label: "Some Assay EC50 (uM)" where the "u" is a micro symbol. I currently have: assay <- "Some Assay" plot(0,xlab=expression(paste(assay," AC50 (",mu,"M)",sep=""))) But …

Read More
In R, how do I replace a string that contains a certain pattern with another string?

I'm working on a project involving cleaning a list of data on college majors. I find that a lot are misspelled, so I was looking to use the function gsub() to replace the misspelled ones with its correct spelling. For …

Read More