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barba
2011 Nov 04
2
Efficiency of factor objects
R factors are the natural way to represent factors -- and should be
efficient since they use small integers. But in fact, for many (but
not all) operations, R factors are considerably slower than integers,
or even character strings. This appears to be because whenever a
factor vector is subsetted, the entire levels vector is copied. For
example:
> i1 <- sample(1e4,1e6,replace=T)
> c1