
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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