How to call reorder within aes_string of ggplot

Question

I need to reorder a barplot from high to low (left to right) using ggplot & aes_string(). For e.g. for a dataframe df <- f(X,Y,Z) this can be done with

 g         


        

Answer 1

Since aes_string works with strings, use paste:

ggplot(top10, aes_string(x=paste0("reorder(",colnames(top10)[num1],", -Y)"),y=meanFeat,
 fill=colnames(top10)[num1])) +  geom_bar(stat="identity")