R help - Mar 2008 - Error: arguments imply differing number of rows

I am simply trying to put 4 boxplots on the same plot, but I keep  
getting the "arguments imply differing number of rows" error. Here, I
have two variables: a factor x of length 1762 (with 4 levels) and a  
numeric variable y of length 1762. How is it that my arguments imply  
differing numbers of rows?
> length(x)
[1] 1762
> length(y)
[1] 1762
> is.factor(x)
[1] TRUE
> is.numeric(y)
[1] TRUE
> plot(x,y)
Error in data.frame(group, x) :
   arguments imply differing number of rows: 1762, 2165
> boxplot(y~x)
Error in data.frame(group, x) :
   arguments imply differing number of rows: 1762, 2165

Try str() on both objects and see what you get.  It
does not look like you have two vectors of
length=1762.

See this for example
====================================================aa <- c("A",
"B", "D", "D","B",
"B","D", "A", "C",
"C", "A","D")
bb <- rnorm(length(aa))
cc <- matrix(rnorm(length(aa)),nrow=2)

length(bb)
length(cc)

boxplot(bb~aa)
boxplot(cc~aa)
=====================================================
--- "Jeffrey T. Steedle" <jsteedle at stanford.edu>
wrote:
> I am simply trying to put 4 boxplots on the same
> plot, but I keep  
> getting the "arguments imply differing number of
> rows" error. Here, I  
> have two variables: a factor x of length 1762 (with
> 4 levels) and a  
> numeric variable y of length 1762. How is it that my
> arguments imply  
> differing numbers of rows?
> 
> > length(x)
> [1] 1762
> > length(y)
> [1] 1762
> > is.factor(x)
> [1] TRUE
> > is.numeric(y)
> [1] TRUE
> > plot(x,y)
> Error in data.frame(group, x) :
>    arguments imply differing number of rows: 1762,
> 2165
> > boxplot(y~x)
> Error in data.frame(group, x) :
>    arguments imply differing number of rows: 1762,
> 2165
> 
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> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained,
> reproducible code.
> 


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