Re: [R] levels() function for a vector

Karen levels returns the levels attribute of a variable, and a vector has no such attribute. This is usually used with a factor, e.g. > temp <- c(3, 5, 5, NA) > levels(factor(temp)) [1] "3" "5" Best wishes Richard Chang Liu wrote: > Hello: > > I'm trying to use levels function, but I don

[R] levels() function for a vector

Hello: I'm trying to use levels function, but I don't know why it's returning NULL. For example: > temp[1] 3 5 5 NA> levels(temp)NULL> Also, I've tried: > list(temp)[[1]][1] "3" "5" "5" NA > levels(list(temp))NULL Is there a specific requirement on the parameter? Karen