Hello all,

I think I am missing something about the sorting parameter in the "match"
command/
Here is an example:


a1 <- data.frame(name = c("D", "B", "C", "A", "A", "C"))
a2 <- data.frame(name = c("A", "B", "C", "D"), num = 1:4)
a1
a2
merge(a1, a2, sort = F, by.x = T)



The result is:

  name num
1    D   4
2    B   2
3    C   3
4    C   3
5    A   1
6    A   1


While I wish my rows to be in the same order as in a1, they are having some
other order.

What am I missing here?


Thanks.


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