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.
Pascal
> attach(ngrad) > is.factor(STNW) [1] FALSE
> ngrad$STNW<-factor(STNW) ## doesn't work > is.factor(STNW) [1] FALSE
> is.factor(STNW) <- T ## doesn't work either Error: couldn't find function "is.factor<-"
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