[R] Fixing scale when plotting

[Achim Zeileis]

Jean Vidal wrote:
> 
> 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 ?

You probably would want to keep the answer to the question as a factor
and not as a numeric vector:
  answer <- factor(c(2,2,2,4,4,4,5), levels=1:5)
  barplot(table(answer))

 
> Thanks for your help.
> 
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