Factor cross products
Construct a product of factors.
cross(..., sep = ":", drop.unused.levels = FALSE)
... |
factors to be crossed. |
sep |
separator between levels |
drop.unused.levels |
should levels that do not appear in cross product be dropped? |
a factor
x <- letters[1:3] y <- c(1,2,1,1,3,1,3) cross(x, y) cross(x, y, drop.unused.levels=TRUE)
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