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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 that gives: "assay EC50 (uM)" rather than the desired "Some Assay EC50 (uM)".
Suggestions? Thanks.
I also tried:
paste(assay,expression(paste(" AC50 (",mu,"M)",sep="")),sep="") 
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Create an Expression in R Programming – expression() Function. expression() function in R Language is used to create an expression from the values passed as argument. It creates an object of the expression class.
bquote() function in R Language is used to quote the arguments passed to it, except the values which are wrapped in '. ()'. It evaluates the wrapped values and quotes the result.
A variable in R can be defined using just letters or an underscore with letters, dots along with letters. We can even define variables as a mixture of digits, dot, underscore and letters.
You want a combination of bquote() and a bit of plotmath fu:
assay <- "Some Assay" xlab <- bquote(.(assay) ~ AC50 ~ (mu*M)) plot(0, xlab = xlab) The ~ is a spacing operator and * means juxtapose the contents to the left and right of the operator. In bquote(), anything wrapped in .( ) will be looked up and replaced with the value of the named object; so .(assay) will be replaced in the expression with Some Assay.
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