[R] help with replacing factors

[Mike Lawrence]

This should work:

levels(black_gray$gray)[levels(black_gray$gray)=='gray20'] = 'blue'

On Sun, May 24, 2009 at 8:15 AM, Andreas Christoffersen
<achristoffersen at gmail.com> wrote:
> Hi,
>
> In the example dataset below - how can I cahnge "gray20", to "blue"
>
> # data
> black <- rep(c("black","red"),10)
> gray <- rep(c("gray10","gray20"),10)
> black_gray <- data.frame(black,gray)
>
> # none of this desperate things works
> # replace(black_gray$gray, gray=="gray20","red")
> # if(black_gray$gray=="gray20"){black_gray$gray<-"blue"}
> # for (i in
> black_gray$gray)if(black_gray$gray[i]=="gray20"){black_gray$gray[i]
> <-"blue"}
> # black_gray$gray=="gray14" <- "blue"
> # black_gray$gray[gray=="gray20"] <- "blue"
> # subset(black_gray,gray=="gray20",gray) <-rep("blue",10)
>
> I have a feeling this is me misunderstanding some very basic stuf about the
> R engine... So any help will be much appreciated.
>
> Thanks in advance
>
> Andreas
>
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>
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-- 
Mike Lawrence
Graduate Student
Department of Psychology
Dalhousie University

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