> -----Original Message-----
> From: r-help-boun...@r-project.org
> [mailto:r-help-boun...@r-project.org] On Behalf Of Daniel Nordlund
> Sent: Friday, December 18, 2009 12:49 PM
> To: r-help@r-project.org
> Subject: [R] how to combine multiple indicator variables in a
> single factor
>
> Say I have a dataframe like this:
>
> df <- data.frame(cbind(c(1,0,0,1),c(0,1,0,0),c(0,0,1,0)))
>
> names(df) <- c('a','b','c')
>
> I would like to create a factor in a new column, where the
> factor values are taken from the column names, like this:
>
> > df2
> a b c f
> 1 1 0 0 a
> 2 0 1 0 b
> 3 0 0 1 c
> 4 1 0 0 a
>
> How would I do this? Thanks,
One possibility is
> df$f <- factor(df$a + df$b*2 + df$c*3, labels=names(df)[1:3])
> df
a b c f
1 1 0 0 a
2 0 1 0 b
3 0 0 1 c
4 1 0 0 a
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
>
> Dan
>
> Daniel Nordlund
> Bothell, WA USA
>
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