Multiple graphs > boxplot

Dear all

I am trying to represent a dependent variable (treatment) against different independent variables (v1, v2, v3....v20). I am using the following command:


However, it provides me only one graph for v1~treatment. For the other comparisons, I have to repeat the same command but changing the parameters. My intentions is to get different plots in just one sheet using only one command. Is it possible to join the same order for all the comparisons in only one command?

Two options:
A)
Melt the dataframe with reshape2::melt
then use boxplot( value ~ interaction(variable,treatment) )

B) 
Melt the dataframe
Use bwplot in lattice with a slightly more full featured formula interface

bwplot(value~cat|variable, data=amelt)

Option B is more beautiful in my opinion.
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David Winsemius, MD
Alameda, CA, USA