find difference between data frames

I'm not sure if you mean to ignore row 6 while ignoring row 4 or not
so here are two solutions (depending on what you meant)

dput(x) # dput is your friend
structure(list(kind = c(1L, 1L, 1L, 1L, 2L, 2L), x = c(8L, 44L,
25L, 36L, 2L, 36L), y = c(9L, 3L, 7L, 20L, 14L, 20L)), .Names = c("kind",
"x", "y"), class = "data.frame", row.names = c("1", "2", "3",
"4", "5", "6"))

## If you want to get rid of duplicates for both cases -- not the
prettiest but it works
table(x[!(duplicated(x[,-1], fromLast = TRUE) | duplicated(x[,-1])),1])

## If you only want to get rid of it for the kind==1 rows (assuming
the data.frame is sorted by kind)
table(x[!duplicated(x[,-1], fromLast = TRUE), 1])

It's usually good practice to say what the answer you expect is to
avoid this sort of confusion.

Michael

I have one data frame, like below?
? ? ? ?kind ? ? ? ?x ? ? ? ?y
1 ? ? ? ?1 ? ? ? ? ?8 ? ? ? ? 9
2 ? ? ? ?1 ? ? ? ?44 ? ? ? ?3
3 ? ? ? ?1 ? ? ? ?25 ? ? ? ?7
4 ? ? ? ?1 ? ? ? ? 36 ? ? ? 20
5 ? ? ? ?2 ? ? ? ? 2 ? ? ? ? ?14
6 ? ? ? ?2 ? ? ? ? 36 ? ? ? 20

so, I want to find unique coordinates in kind 1 rather than kind 2, ex, row
4 should be excluded, is that possible?

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