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comienza
2006 Nov 09
1
Merge: how can I keep discarded values?
...o save the non-matching rows
in a separate file.
The problem is how to retrieve the non-matching rows in R.
Example:
DATASET A
code nomi
A1 Franco
A2 Mario
A3 Andrea
A4 Sandro
A5 Luca
DATASET B
code book
A1 Guerra e Pace
A1 Storia di Roma
A2 La coscienza di Zeno
A4 Ivanhoe
A1 I Malavoglia
A2 Jude the obscure
when merging two rows are unmatched:
A3 Andrea
A5 Luca
And these are exactly the rows I would like to store in a separate
file/dataset.
I tried with:
AM<-merge(A,B,all=TRUE)
A1<-AM[is.na(AM$book),]...