R help - Mar 2007 - Adding bars to the right of existing ones using barplot

I'm trying to create a barplot that has two sets of data next to each  
other.  I'm using barplot with the add=TRUE option, but this simply  
adds the second dataset on top of the first, obscuring it.  How do I  
add the new data to the right on the existing barplot so that both  
sets are visible?  I've been playing with all sorts of option and  
reading the list archives with no luck.

Thank you anyone who has the answer.

- Jason

Add/subtract a small constant to/from your latter dataset (x-values) and 
plot it without axes.

Petr

Jason Horn napsal(a):
> I'm trying to create a barplot that has two sets of data next to each  
> other.  I'm using barplot with the add=TRUE option, but this simply  
> adds the second dataset on top of the first, obscuring it.  How do I  
> add the new data to the right on the existing barplot so that both  
> sets are visible?  I've been playing with all sorts of option and  
> reading the list archives with no luck.
> 
> Thank you anyone who has the answer.
> 
> - Jason
> 
> ______________________________________________
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> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
-- 
Petr Klasterecky
Dept. of Probability and Statistics
Charles University in Prague
Czech Republic

On Mar 13, 2007, at 3:34 PM, Jason Horn wrote:
> I'm trying to create a barplot that has two sets of data next to each
> other.  I'm using barplot with the add=TRUE option, but this simply
> adds the second dataset on top of the first, obscuring it.  How do I
> add the new data to the right on the existing barplot so that both
> sets are visible?  I've been playing with all sorts of option and
> reading the list archives with no luck.
Something like this?

a<-rnorm(3,2,1)
b<-rnorm(3,2,1)
barplot(rbind(a,b), beside=TRUE)


?barplot for more options ( in particular, the height argument)

> Thank you anyone who has the answer.
>
> - Jason
Haris Skiadas
Department of Mathematics and Computer Science
Hanover College

On Tue, 2007-03-13 at 15:34 -0400, Jason Horn wrote:
> I'm trying to create a barplot that has two sets of data next to each  
> other.  I'm using barplot with the add=TRUE option, but this simply  
> adds the second dataset on top of the first, obscuring it.  How do I  
> add the new data to the right on the existing barplot so that both  
> sets are visible?  I've been playing with all sorts of option and  
> reading the list archives with no luck.
> 
> Thank you anyone who has the answer.
> 
> - Jason
You might want to take note of the 'space' argument in ?barplot:

 a <- 1:3
 b <- 4:6

 # concatenate the two vectors and specify
 # that the space before the 4th bar should be
 # wider

 barplot(c(a, b), space = c(1, 1, 1, 3, 1, 1))

Also take note that barplot() returns the bar midpoints, which can be
helpful if you want to add any additional annotation to the plot.  See
the examples in ?barplot.

HTH,

Marc Schwartz