could someone explain what is happening below ? I was trying to solve a
related question on the list and then , as I was solving it,
I was getting strange answers and then I noticed below. It's obviously
not a bug but I don't get it. Thanks.
m <- data.frame(class = c("birds", "planes"), feather = c(1,3), jet =
c(2,4))
d1 <- data.frame(jet = c(10), feather = c(20))
print(m)
m[,-1]*2 # THIS IS FINE
m[,"jet"]*2 # THIS IS FINE
print(d1["jet"]) # THIS IS FINE
m[,"jet"]*d1["jet"] # THIS IS ODD
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