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Usage
from:to # sequence
a:b # cross of factor
where:
- from, starting value of sequence and to: (maximal) end value of the sequence.
- a, b factors of the same length.
Example
Integer Sequence
> 1:4
[1] 1 2 3 4
> 6:pi
[1] 6 5 4
Real Sequence
> pi:6
[1] 3.141593 4.141593 5.141593
“cross” factor
> f1 <- gl(2, 3); f1
[1] 1 1 1 2 2 2
Levels: 1 2
> f2 <- gl(3, 2); f2
[1] 1 1 2 2 3 3
Levels: 1 2 3
> f1:f2 # a factor, the "cross" f1 x f2
[1] 1:1 1:1 1:2 2:2 2:3 2:3
Levels: 1:1 1:2 1:3 2:1 2:2 2:3
Documentation / Reference
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