[R] plotting box plots on same x

BJ erithid at bellsouth.net
Fri May 27 16:17:30 CEST 2005

I am trying to construct a graph of 6 box plots of blood pressures. I 
want them to be on a single set of axis and I want the SBP to be ontop 
of the DBP. I have an array bp with the data in it and I tried

 boxplot(data.frame(a), main = "Blood Pressures", at=c(1,1,2,2,3,3), 

which is close to what I want, but it gives me a bunch of empty space at 
the end. is there a better way to do this to avoid this?

As always, Thank You. ~Erithid

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