Combine (concatenate) several factor objects, to produce a factor.
cat.factor(…)
Any number of arguments. Each argument should be a factor, or will be converted to a factor.
A factor, whose length is the sum of the lengths of all arguments. The levels of the resulting factor are the union of the levels of the arguments.
The arguments … are concatenated as they would be using c() or cat(), except that factor levels are retained and merged correctly. See the Examples.
…
c()
cat()
c.
c
# NOT RUN { f <- factor(letters[1:3]) g <- factor(letters[3:5]) f g cat(f,g) c(f,g) cat.factor(f, g) # }
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