[Solved] adding each element each row of two columns together in the same file without loops in R

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A summary of options suggested in the comments (and some others):

dd<-data.frame(
    A= 1:3,
    B= 2:4
)

You can get the sum of the columns with

  • dd$A + dd$B
  • rowSums(dd)
  • with(dd, A + B)
  • dd[,1]+ dd[,2]
  • dd[,"A"]+ dd[,"B"]
  • apply(dd, 1, sum)
  • do.call('+', dd)
  • Reduce("+",dd)

solved adding each element each row of two columns together in the same file without loops in R