On Nov 2, 2010, at 2:14 AM, song song wrote:
hi, everybody, my question is:
suppose I have two data sets, set A is large and have variables like
ID,
Gender, Income. Set B is small and suppose only has ID.
Now I want to get a subset from data set A which contains ID from
Set B.
Try:
A[A$ID %in% B$ID, ]
Or:
subset(A, ID %in% B$ID)
How to do this in R>? Is there any commands to do this?
Thank you
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--
David Winsemius, MD
West Hartford, CT
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