Hi,

I want to add annotation color to a normal ggplots2 figure (barplot) like it is used for example in pheatmap.

pheatmap(assay(ntd)[select,], cluster_rows=FALSE, show_rownames=FALSE, cluster_cols=FALSE, annotation_col=df)

For a pheatmap I add a df for annoation_col.
How can I do it for other figures?

Thanks for your help, best Dagmar

how do your data look?

good examples are posted here 

generally you have a data.frame that looks like

library(ggplot2)
d <- data.frame(value=sample(1:100,20),
                names=rep(c("a","b","c","d"),each=5),
                groups=rep(c("fancy","non-fancy"),each=10))

and then you can plot coloring/annotating based on group

ggplot(d, aes(x=names,y=value,fill=groups)) + geom_bar(stat="identity")