[R] ggplot boxplot - how to order categories

[Raj Minhas]

I am interested in creating a boxplot using ggplot or qplot where I can
specify the order of the categories being plotted on the x-axis. For
example, the following command plots the categories (diamond color) in
alphabetic order (D, E, ..., J):

qplot(color, price/carat, data=diamonds, geom="boxplot")

I want to know how I can modify this command so that the categories are
plotted in a different order (say, J, D, E, I, H, F, G).

Thanks in advance.

-Raj.
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