R help - May 2011 - ggplot2 and add circle

Dear all,
today I have writted the following code,
to plot the contents of some matrices I have

plot_shad_f
function(f){
  library(ggplot2)
  dev.new()
  plotdata<-melt(f)
  names(plotdata)<-c('x','y','z')
  v<-ggplot(plotdata, aes(x, y, z = z))
  print(v + geom_tile(aes(fill=z))) 
}

I would like to ask your help add a small circle in this plotting. What would be
the easiest way to do that in ggplot2?

Best Regards
Alex

You should provide reproducible data in addition to your code. 

S
On Tuesday, May 10, 2011 at 11:54 AM, Alaios wrote: 
> Dear all,
> today I have writted the following code,
> to plot the contents of some matrices I have
> 
> plot_shad_f
> function(f){
>  library(ggplot2)
>  dev.new()
>  plotdata<-melt(f)
>  names(plotdata)<-c('x','y','z')
>  v<-ggplot(plotdata, aes(x, y, z = z))
>  print(v + geom_tile(aes(fill=z))) 
> }
> 
> I would like to ask your help add a small circle in this plotting. What
would be the easiest way to do that in ggplot2?
> 
> Best Regards
> Alex
> 
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
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