I am sorry to ask such question, but I can't find a solution...
I have a dataframe 'd2004' and I want to remove two columns:
'd2004$concentration' and 'd2004$stade".
I could do it just as follows:
> names(d2004)
[1] "Localite" "Date" "parcelle" "maille"
"presence.plant" "concentration" "stade.culture"
[8] "stade" "Trou" "Horizon" "Profondeur"
> d2004 <- d2004[, -c(6, 8)]
but I'd like to use column names (to avoid finding column numbers each
time).
I cannot find an easy way to operate...
I wonder why that works:
> d2004[, "concentration"]
and this don't:
> d2004 <- d2004[, -c("concentration", "stade")]
Thanks...
Jacques VESLOT / CIRAD
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