fct_cross: Combine levels from two or more factors to create a new...
In sindribaldur/poorcats: Tools for Working with Categorical Variables (Factors)

Description Usage Arguments Value Examples

Computes a factor whose levels are all the combinations of the levels of the input factors.

1	fct_cross(..., sep = ":", keep_empty = FALSE)

`...`	<`dynamic-dots`> Additional factors or character vectors.
`sep`	A character string to separate the levels
`keep_empty`	If TRUE, keep combinations with no observations as levels

The new factor

fruit <- factor(c("apple", "kiwi", "apple", "apple"))
colour <- factor(c("green", "green", "red", "green"))
eaten <- c("yes", "no", "yes", "no")
fct_cross(fruit, colour)
fct_cross(fruit, colour, eaten)
fct_cross(fruit, colour, keep_empty = TRUE)