This works too: t.d$V712 <- NULL On Thursday 21 September 2006 22:28, Gavin Simpson wrote: > On Thu, 2006-09-21 at 20:01 +0200, Thomas Preuth wrote: > > delete a entire vector of a dataframe > > > > Hello, > > > > i want to delete a vector and tried "rm (t.d$V712)". This did not work, > > message was, could not find variable. I thought the $ defines the vectro > > in a dataframe, when I just type "t.d$V712" the content of this vector > > is displayed. > > > > Greetings, Thomas > > You can't do that, and that is not what the error message said exactly - > which should have told you something was wrong with your thinking as it > also said "1: remove: variable "$" was not found". Instead, copy over > the object, minus the column you want to delete: > > dat <- as.data.frame(matrix(rnorm(100), nrow = 10)) > names(dat) <- paste("Var", 1:10, sep = "_") > dat > # now we don't want column Var_6 > dat <- dat[, -6] > # or if we don't know which column is Var_6 you could do > not.want <- which(names(dat) %in% "Var_7") # now don't want Var_7 > dat <- dat[, -not.want] > dat > > This can be extended to many variables: > > not.want <- which(names(dat) %in% c("Var_10", "Var_2", "Var_8")) > dat <- dat[, -not.want] > dat # only 1, 3, 4, 5, 9 left > > HTH > > G
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