Message-ID: <OF446C3FC5.F5C94666-ONC1257672.003AA170-C1257672.003BF131@precheza.cz>
Date: 2009-11-18T10:54:44Z
From: PIKAL Petr
Subject: Odp: recode according to old levels
In-Reply-To: <4B03AF48.9010105@gmx.de>
Hi
r-help-bounces at r-project.org napsal dne 18.11.2009 09:24:40:
> Dear R-users,
>
> i try to recode a factor according to old levels
>
> F <- factor(sample(c(rep("A", 4), rep("B",2), rep("C",5))))
>
> recode(F, "levels(F)[c(1,3)]='X'; else='Y'")
>
> i tried to work with eval or expression around levels(F)[c(1,3)], but
> nothing seems to work.
>
I am not sure if recode does not want as an input a numeric vector.
However for recoding levels of factor you can add a vector of new levels
in correct order.
set.seed(111)
F <- factor(sample(c(rep("A", 4), rep("B",2), rep("C",5))))
levels(F)<-c("X","X","Y")
F
[1] Y Y X X X Y X X X Y Y
Levels: X Y
or maybe
levels(F)<- ifelse(levels(F) %in% c("A","B"), "X", "Y")
Regards
Petr
>
> Many thanks if anyone could tell me what i've missed and what's the
> problem here.
>
> best regards
>
> Andreas
>
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