> DF <- data.frame(a=1:2, b=3:4) > DF$a-DF$b [1] -2 -2 > DF[,"a"]-DF[,"b"] [1] -2 -2
hope this helps. spencer graves
Ulrich Leopold wrote:
Dear list,
could someone point me to the right command to subtract 2 columns in a data.frame. Might be a bit embarrassing question. But I cannot figure out how to do this simple command in R.
Thanks, Ulrich
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