[R] About "Plot.new"

[cathelf]

Hi, sorry for bothering your guys. 
I will trying to make some nice graph using boxplot. when I check the help
file of boxplot, there is a sample code as:

 boxplot(len ~ dose, data = ToothGrowth, add = TRUE,
             boxwex = 0.25, at = 1:3 + 0.2,
             subset = supp == "OJ", col = "orange")
     legend(2, 9, c("Ascorbic acid", "Orange juice"),
            fill = c("yellow", "orange"))

But when I run it, it shows the following error:
Error in xypolygon(xx, yy, lty = "blank", col = boxfill[i]) : 
        plot.new has not been called yet


what does it mean? If  I first run "plot.new()", then running the above
code, only the x-axis and y-axis is on the graph, no boxplot inside. 

Can anyone tell me how to call  plot.new or at least how to run the above
code correctly?

Thank you very much!


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