[datatable-help] Replacing NA values for a categorical variable results in numerical replacements

[affableambler]

This may not be the most elegant solution, but one way to do it would be to
convert the factor to a character vector, replace the NAs, and then convert
it back to a factor:

Prestige.bc<-Prestige
Prestige.bc$type<-as.character(Prestige.bc$type)
Prestige.bc$type[which(is.na(Prestige.bc$type))]<-'bc'
Prestige.bc$type<-as.factor(Prestige.bc$type)




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