[R] converting column to factor *within* a data frame
Pascal A. Niklaus
Pascal.Niklaus at unibas.ch
Wed Nov 5 09:50:01 CET 2003
I repeatedly encounter the following problem: After importing a data set
into a data frame, I wish to set a column with numeric values to be a
factor, but can't figure out how to do this. Also, I do not wish to
write as.factor(x) all the time. I can create a new vector with x <-
factor(x), but the new vector resides outside the attached data frame.
> ngrad$STNW<-factor(STNW) ## doesn't work
> is.factor(STNW) <- T ## doesn't work either
Error: couldn't find function "is.factor<-"
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