interaction {base}

R Documentation

Compute Factor Interactions

Description

interaction computes a factor which represents the interaction of the given factors. The result of interaction is always unordered.

Usage

interaction(..., drop=FALSE)

Arguments

...	The factors for which interaction is to be computed.
drop	If drop is TRUE, empty factor levels are dropped from the result. The default is to retain all factor levels.

Value

A factor which represents the interaction of the given factors.

See Also

factor.

Examples

a <- gl(2, 2, 8)
b <- gl(2, 4, 8)
interaction(a, b)

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