Set operations
These functions override the set functions provided in base to make them
generic so that efficient versions for data frames and other tables can be
provided. The default methods call the base versions. Beware that
intersect(), union() and setdiff() remove duplicates.
union_all(x, y, ...)
x, y |
objects to perform set function on (ignoring order) |
... |
other arguments passed on to methods |
mtcars$model <- rownames(mtcars) first <- mtcars[1:20, ] second <- mtcars[10:32, ] intersect(first, second) union(first, second) setdiff(first, second) setdiff(second, first) union_all(first, second) setequal(mtcars, mtcars[32:1, ]) # Handling of duplicates: a <- data.frame(column = c(1:10, 10)) b <- data.frame(column = c(1:5, 5)) # intersection is 1 to 5, duplicates removed (5) intersect(a, b) # union is 1 to 10, duplicates removed (5 and 10) union(a, b) # set difference, duplicates removed (10) setdiff(a, b) # union all does not remove duplicates union_all(a, b)
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.