Hi netters,
Suppose I have two data frames X and Y. X has three colnames A, B and C. Y has
three colnames A,B and D.
I want to combine them into one matrix, joining the rows having the same A and
B values (X$A==Y$A and X$B = Y$B). So the resulting dataframe has four
variables/columns: A,B,C and D.
I was wondering what's the best way to do it in R. Could anyone give me some
advice?
Thanks!
Zhihua Li
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