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I have written a function to plot data which will be used for various different chemistries. A simplified version is: plot_data <- function(risk,levels,chem,sd2,measure){ plot(risk, levels,main=paste ("per", sd2, measure, "\n in usual", chem)) } The problem is with the title. This works fine if the variable "chem" is just text, but if it is an expression then

Background: I use R for a fair-sized graphics program, intended for na?ve users. This works, but a less-na?ve user wants it to generate code producing the graphs that he can then modify (but which will not contain my numerous manipulations and attempts to discern what the user wants). Quite possibly this is a standard R activity, but I've been unable to find it; likely I have a mental