How to combine do.call() plot() and expression()

I am getting an error when I try and combine using `expression` with `do.call` and `plot`. ``` x <- 1:10 y <- x^1.5 ``` I can get the plot I want by using only the `plot` function: ``` plot(y~x,xlab=expression(paste("Concentration (",mu,"M)"))) ``` However, I would like to implement my plot using `do.call`. I have a really long list of parameters stored as a list, `p`. However, when I try and pass the list to `do.call` I get the following error: ``` p <- list(xlab=expression(paste("Concentration (",mu,"M)"))) do.call(plot,c(y~x,p)) Error in paste("Concentration (", mu, "M)") : object 'mu' not found ``` I also tried defining the formula explicitly in the args passed to `do.call`. ie. `do.call(plot,c(formula=y~x,p))`. I do not understand why I am getting the error - especially because the following does not give an error: ``` do.call(plot,c(0,p)) ``` (and gives the desired mu character in the xaxis).