Hi Judith,
You should use double brackets, like this:
df[[variab]]<-factor(df[[variab]], levels=c("A2B","B31","C33"))
see ?"[" for details, noting that the help page assumes that you know
data.frames are list-like objects.
Best,
Ista
On Mon, Feb 6, 2012 at 2:03 PM, Judith Flores <jur...@yahoo.com> wrote:
> Hello R-users,
>
> I have a data frame whose names of columns I don't know a priori, but the
> user of my code will know them. The user is supposed to save the name of the
> column that will need some reordering of the levels of the factor later on.
> The name of the column will be saved in an object called:
>
> variab
>
> the data frame is called df.
>
>
> If I try to the do following:
>
> df[variab]<-factor(df[variab], levels=c("A2B","B31","C33"))
>
> it won't work because df[variab] is a data frame. The reason for reordering
> the levels of the factor is because once that variable is plotted, the levels
> of the factor need to appear in certain order.
>
> How can I re-order the levels of a factor whose name I don't know?
>
>
> Thank you,
>
> Judith
> [[alternative HTML version deleted]]
>
>
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>
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