[R] Combining boxplot

[William Dunlap]

Does the following produce what you want?
   > lst <- c(Observed=with(df1, split(x, type)), Simulated=with(df2, split(x, type)))
   > lst <- lst[c(seq(1,length(lst)-1,by=2), seq(2,length(lst),by=2))]
   > boxplot(lst, col=rep(c("gray","red"),len=length(lst)))

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf
> Of Philippe Massicotte
> Sent: Monday, February 25, 2013 8:04 AM
> To: r-help at r-project.org
> Subject: [R] Combining boxplot
> 
> Hi everyone.
> 
> I have two data frames that contain the same variables but with different
> number of observation.
> 
> I would like to know it was possible to combine the data so I can have
> "paired" boxplot on the same figure.
> 
> For example,
> 
> df1 = data.frame(x = rnorm(100))
> df1$type = ifelse(df1$x <= 0 , "type1", "type2")
> 
> df2 = data.frame(x = rnorm(50,0,2))
> df2$type = ifelse(df2$x <= 0 , "type1", "type2")
> 
> ## How to combine boxplot
> boxplot(df1$x~df1$type)
> boxplot(df2$x~df2$type)
> 
> df1 would be observed data whereas df2 would be simulated data.
> 
> I would like to have the two categories (type1 and type2) on x axis and a
> colour to differentiate simulated vs observed datra.
> 
> Regards,
> Phil
> 
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