[R] Formatting question for separate polygons

[Uwe Ligges]

On 11.02.2010 22:38, Tim Clark wrote:
> Dear List,
>
> I am trying to plot several separate polygons on a graph.  I have figured out how to do it by manually, but have too much data to use such a tedious method.  I would appreciate your help.  I have made a simple example to illustrate the problem.  How can I get x into the proper format (x1)?
>
> #Sample data
> x<-c(1,2,3,4,5,6)
> y<-c(1,2,2,1)
>
> #I need to format the data like this
> x1<-c(1,1,2,2,NA,3,3,4,4,NA,5,5,6,6,NA)
> y1<-rep(c(1,2,2,1,NA),length(x)/2)



x1 <- as.numeric(rbind(matrix(rep(x, each=2), nrow=2), NA))

Uwe Ligges


> #Final plot
> plot(c(1,6), 1:2, type="n")
> polygon(x1,y1,density=c(40))
>
>
> Thanks,
>
> Tim
>
>
> Tim Clark
> Department of Zoology
> University of Hawaii
>
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