[R] How to add marker in Stacked bar plot?

Manish Gupta mandecent.gupta at gmail.com
Tue Jul 10 05:37:32 CEST 2012

I am working on stacked bar plot and want to add marker(arrow) in stacked
bar plot.   

DF=data.frame(names=c("tomato", "potato", "cabbage", "sukuma-wiki",
"terere"), freq=c(7,4,5,8,20))
barplot(as.matrix(DF[,2]), col=heat.colors(length(DF[,2])), legend=DF[,1],
xlim=c(0,9), width=2)

http://r.789695.n4.nabble.com/file/n4635946/Screenshot.png . 

 Image with marker:


How can i add marker or arrow for particular stack in graph.


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