factor(new.fact) will do the trick. But that will recode the levels and
that might be something you don't want.
> 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
> factor(new.fact)
[1] A A A B B B
Levels: A B
Cheers,
Thierry
------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Reseach Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium
tel. + 32 54/436 185
[EMAIL PROTECTED]
www.inbo.be
-----Oorspronkelijk bericht-----
Van: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Namens Afshartous, David
Verzonden: dinsdag 12 september 2006 17:23
Aan: [email protected]
Onderwerp: [R] levels of factor when subsetting the factor
All,
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?
cheers,
dave
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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