[R] Fixing scale when plotting

[Jean Vidal]

I would like to plot on the same page - with mfrow=c(2,5) - several 
barplots which describe answers to a question in a survey, ranging from 1 
to 10. Sometimes, values are not present in the dataset (nobody answers "1" 
to question A). To keep the graphs on the same scale, I tried, with little 
succes, to fix the scale, so that a level is represented even if no value 
is present.
With an example :
barplot(table(c(1,2,2,3,4,4,5)))
barplot(table(c(2,2,2,4,4,4,5)))
How to have the second plot on the same scale as the first, ranging from 1 
to 5, with all levels ?

Thanks for your help.

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