[R] levels of factor

Luis Rideau Cruz Luisr at frs.fo
Tue Aug 17 16:30:12 CEST 2004


I have a data frame wich I subset like :

a <- subset(df,df$"column2" %in% c("factor1","factor2")  & df$"column2"==1)

But when I type levels(a$"column2") I still get the same levels as in df (my original data frame)

Why is that?
Is it right?


Luis Ridao Cruz
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