>From the help for barplot

?barplot

The argument "... space may be specified by two numbers, where the first 
is the space between bars in the same group, and the second the space 
between the groups. If not given explicitly, it defaults to c(0,1) if 
height is a matrix and beside is TRUE ..."

So, try 

barplot(t(data), beside=T, ylim=c(0,200), space=c(0.2, 1),
     col=c("red","yellow"), main="Species rank curve", 
     ylab="Number of individuals")

or something like that.

It's helpful to post a small subset of example data along with your code, 
so that folks can actually take it for a test drive.  It's also helpful to 
post example code along with errors/warnings/output from attempts to solve 
the problem.  You refer to an attempt to try using space, and said "it is 
not working" but didn't provide enough information for a reader to know 
what you tried and how it didn't work.

Jean

Michael Eisenring wrote on 08/25/2011 03:45:27 AM:
> 
> Hello,
> for my project I wanted to create a side-by-side barplot. For each 
> of 143 treatments there are always two measurement. This two 
> measurements (a pair) are represented by a red resp. a yellow bar. I
> was able to write the code for the side-by-side barplot. 
> Unfortunately however I am not able to  vary the distance between 
> the measurement pairs ( the distance from one red-yellow bar pair to
> the next). How can I do this in the case of a side-by-side barplot? 
> In a normal barplot this can be done by using the command: "space()"
> but in the case of a side-by-side barplot it is not working( in fact
> if I work with the "space" command R is changing somehow the 
> coloration of my bars).
> I would be very grateful if anyone could help me with my problem.
> Thank you very much
> 
> My R code:
> 
> barplot(t(data), beside = TRUE,ylim=c(0,200),col=c
> ("red","yellow"),main="Species rank curve",ylab="Number of individuals")
> 
> Yours sincerely
> M.Eisenring
> 
> PS: This is the first time I am using the R mailing list. Please let
> me know if I made any mistakes regarding the manner in which 
> questions should be asked etc.

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