[R] How to get names of a list into df:s?
Lauri Nikkinen
lauri.nikkinen at iki.fi
Thu Feb 21 19:22:40 CET 2008
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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