[R] How to get names of a list into df:s?
John Kane
jrkrideau at yahoo.ca
Thu Feb 21 23:04:40 CET 2008
I don't see any difference
--- Lauri Nikkinen <lauri.nikkinen at iki.fi> wrote:
> R users,
>
> I have a simple lapply question.
>
> g <- list(a=1:3, b=4:6, c=7:9)
> g <- lapply(g, function(x) as.data.frame(x))
> lapply(g, function(x) cbind(x, var1 = rep(names(g),
> each=nrow(x))[1:nrow(x)]))
>
> I get
>
> $a
> x var1
> 1 1 a
> 2 2 a
> 3 3 a
>
> $b
> x var1
> 1 4 a
> 2 5 a
> 3 6 a
>
> $c
> x var1
> 1 7 a
> 2 8 a
> 3 9 a
>
> And I would like to have
>
> $a
> x var1
> 1 1 a
> 2 2 a
> 3 3 a
>
> $b
> x var1
> 1 4 b
> 2 5 b
> 3 6 b
>
> $c
> x var1
> 1 7 c
> 2 8 c
> 3 9 c
>
> How should I modify my lapply clause to achieve
> this?
>
> Best regards,
> Lauri
>
> > sessionInfo()
> R version 2.6.1 (2007-11-26)
> i386-apple-darwin8.10.1
>
> locale:
> C
>
> attached base packages:
> [1] stats graphics grDevices utils datasets
> methods base
>
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