merge(t1,t2, by=a, all.x = TRUE)
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek
team Biometrie Kwaliteitszorg
Gaverstraat 4
9500 Geraardsbergen
Belgium
Research Institute for Nature and Forest
team Biometrics Quality Assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium
tel. + 32 54/436 185
thierry.onkel...@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-boun...@r-project.org
[mailto:r-help-boun...@r-project.org] Namens Joel
Verzonden: maandag 22 november 2010 15:07
Aan: r-help@r-project.org
Onderwerp: [R] Prob with merge
Hi
Im trying to merge 2 data frames using merge but I dont get
the result i want
Lets make this a small test as my data set is to big to put
in here :).
t1-data.frame(a=c(1,2,3,4,5,6),b=c(11,11,NA,11,11,11))
t1-data.frame(a=c(1,2,3,4,5,8),b=c(12,12,12,12,12,32))
this gives me:
t1
a b
1 1 12
2 2 12
3 3 12
4 4 12
5 5 12
6 8 32
t2
a b
1 1 11
2 2 11
3 3 NA
4 4 11
5 5 11
6 6 11
now when i merge i get:
merge(t1,t2, by=a)
a b.x b.y
1 1 12 11
2 2 12 11
3 3 12 NA
4 4 12 11
5 5 12 11
But what I want is it to look like:
a b.x b.y
1 1 12 11
2 2 12 11
3 3 12 NA
4 4 12 11
5 5 12 11
6 8 32 NA
So I keep all of the rows from t1 and get an NA in dose slots
at the t2 part of the merge.
Anyone know how to accomplice this?
Thx
//Joel
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