Grouped bar graph custom colours

Question

I have the following data and wish to create a grouped bar graph like so:

data<-as.data.frame(c(\"a\",\"b\",\"c\",\"a\",\"b\",\"c\"))
colnames(data)<-\         


        

Answer 1

You need to get group and fill mapped to the right variable:

ggplot(data, aes(x=X, y=Z, group=Y, fill=X)) +
         geom_bar(stat="identity", colour="black", position="dodge", size=0.25, width=0.8, alpha=0.8) + 
  scale_fill_manual(values=c("red","blue"))