Re: [R] question about boxplot axis

From: Marc Schwartz <>
Date: Tue 05 Jul 2005 - 05:00:08 EST

On Mon, 2005-07-04 at 11:35 -0700, yyan liu wrote:
> Hi:
> I have a question making side by side boxplot.
> My response is numeric and I want to make a side by
> side boxplot of it accroding to a factor vector. So,
> there are several boxplots on the same plot. Each
> boxplot is with respect to one level for a factor. The
> levels of
> the factor are some characters. When I make the plot,
> the boxplots are arranged according to the alphabetic
> order of the levels. My question is that how I can
> change the order the boxplots are arranged. For
> example,
> fac<-c("a","b","c","d")
> boxplot(time.vec~fac,xlab="Events",ylab="Time In
> Days",col="yellow")
> Then the boxplots are arranged in the order of
> "a","b","c","d". But for some reason, I want it to be
> "c","a","d","b". Any suggestion about this question?
> thx a lot!
> liu zhong

time.vec <- rnorm(40)
fac <- factor(sample(letters[1:4], 40, replace = TRUE))

# Default ordering
boxplot(time.vec ~ fac, xlab="Events",

        ylab="Time In Days", col="yellow")

# Now adjust factor levels as you desire fac <- factor(fac, levels = c("c", "a", "d", "b"))

# Redo boxplot with new ordering
boxplot(time.vec ~ fac, xlab="Events",

        ylab="Time In Days", col="yellow")

See ?factor for more information. boxplot() sequences the boxes based upon the factor levels.

HTH, Marc Schwartz mailing list PLEASE do read the posting guide! Received on Tue Jul 05 05:08:35 2005

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