Create a vector of element positions of duplicates in the output of expand.grid on 2 identical vectors. An efficient method of creating combinations for 2 variables.
the length of vector passed to
(optional) set to TRUE to also select the elements where the 2
items are identical. The output of expand.grid, subset to remove
duplicates with 'omit.id' set to TRUE would be the equivalent of
A numeric vector.
n <- 3 expand.grid(1:n, 1:n) expand.grid(1:n, 1:n)[-grid_dup(n), ] expand.grid(1:n, 1:n)[-grid_dup(n, omit.id = TRUE), ]
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