[R] merging data.frames columnwise (rbind with different variables, lengths)

[ONKELINX, Thierry]

Dear Stefan,

Why not use merge() if you want to merge two datasets? ;-)

df1 <- data.frame(A = c(1,2), B = c("m","f"), C = c("at home", "away"))
df2 <- data.frame(A = c(2), C = c("at home"))
merge(df1, df2, all = TRUE) 

HTH,

Thierry

------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
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Belgium 
tel. + 32 54/436 185
Thierry.Onkelinx op inbo.be 
www.inbo.be 

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces op r-project.org [mailto:r-help-bounces op r-project.org]
Namens Stefan Uhmann
Verzonden: donderdag 11 december 2008 13:46
Aan: r-help op r-project.org
Onderwerp: [R] merging data.frames columnwise (rbind with different
variables,lengths)

Dear List,

I have two dataframes with overlapping colnames and want to merge them. 
  Actually, what I want is more similar to rbind, but the dataframes 
differ in their columns. Here are the examples:

df1 <- data.frame(A = c(1,2), B = c("m","f"), C = c("at home", "away"))
df2 <- data.frame(A = c(2), C = c("at home"))

Here the desired result:

   A B        C
1 1 m  at home
2 2 f     away
3 2 NA at home

Thanks for any help,
Stefan

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