conf.design (version 2.0.0)

join: Amalgamate two or more factors.

Description

Joins two or more factors together into a single composite factor defining the subclasses. In a model formula join(f1, f2, f3) is equivalent to f1:f2:f3.

Usage

join(...)

Arguments

...

Two or more factors or numeric vectors, or lists containing these kinds of component.

Value

A single composite factor with levels made up of the distinct combinations of levels or values of the arguments which occur.

Side Effects

None.

Details

Similar in effect to paste, which it uses.

See Also

:, paste, rjoin, direct.sum

Examples

within(data.frame(f = gl(2, 3)), {
  g <- gl(3,2,length(f))
  fg <- join(f, g)
})
###   f  fg g
### 1 1 1:1 1
### 2 1 1:1 1
### 3 1 1:2 2
### 4 2 2:2 2
### 5 2 2:3 3
### 6 2 2:3 3