[R] levels of factor when subsetting the factor

From: Afshartous, David <afshart_at_exchange.sba.miami.edu>
Date: Tue 12 Sep 2006 - 15:22:58 GMT



When I take a subset of a factor the reduced factor still maintains all the original levels of the factor when say forming the key in a plot. The data is correct, but the variable still "remembers" the original levels. See below for reproducible code. Does anyone know how to fix this?

fact = as.factor(c(rep("A", 3),rep("B", 3), rep("C", 3))) new.fact = fact[1:6]
> new.fact

[1] A A A B B B
Levels: A B C ## should only show A B

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