?merge may be what you are looking for. If not, you should clarify what you want to do.
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Jie TANG <totangjie@gmail.com> wrote:

hi ,
Now I have two dataset and want to compare them with same sample.
Dataset A:
year mon day obs
2010 03 12 12
2010 03 18 22
2010 04 12 62
2010 07 24 29

Dataset B:
year mon day obs
2010 03 12 15
2010 04 12 57
2010 07 24 32
2010 08 23 15


As you see,dataset A and B have several observation data but their obs data
is not same everyday.
Now I want to compare the data from two dataset in the same time.
How could I write the R script?

errdata<-subset(A,A$V11==Bdata$V11 & A$V12==B$V12)

this command seems failed.How could I?

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