r - apply function to group values while plotting (ggplot) -

r - apply function to group values while plotting (ggplot) -

just wondering if possible manipulable y-axis of ggplot geom_bar

for example:

library(plyr) df1 <- data.frame(a=c(5,5,10,10,10)) df2 <- ddply(df1,.(a),sum) ggplot(df2,aes(a,v1)) + geom_bar(stat="identity")

instead of aggregating df1, possible produce plot straight in ggplot?

you can using stat_summary:

ggplot(df1, aes(a, a)) + stat_summary(fun.y=sum, geom="bar")

r ggplot2