Aggregate R sum

Question

I\'m writting my first program in R and as a newbie I\'m having some troubles, hope you can help me.

I\'ve got a data frame like this:

> v1<-c         


        

Answer 1

This is fairly straightforward with the plyr library.

library("plyr")
ddply(datos, .(Position), colwise(sum))

If you have additional non-numeric columns that shouldn't be averaged, you can use

ddply(datos, .(Position), numcolwise(sum))