Hi,

I have a function which generates many plots. To keep it simple, let's say I want to set the main title based on where we are in nested loops.

So, something like

vectorA = c("a","b","c")
vectorB = c("a","b","c")

for(ii in vectorA) { for(jj in vectorB) {
  plot(0:1,0:1)
  title(main = paste(ii,jj))
}

that part is easy! The question is what if I wanted vectorA to be an expression?

I'd like to be able to set vectorA = c(expression(paste("TNF-",alpha)),expression(paste("IFN-",gamma))), and have the plot title show the greek letters.

Obviously, in the for-loop I could build the expression all at once, but there are lots of programmatic reasons I'd like to be able to have this program structure. Is there a solution which modifies either/both (1) the setting of main in the loop (2) how I define the vector outside of the loop?


thanks, Daryl

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