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base (version 3.0.3)

gl: Generate Factor Levels

Description

Generate factors by specifying the pattern of their levels.

Usage

gl(n, k, length = n*k, labels = seq_len(n), ordered = FALSE)

Arguments

n
an integer giving the number of levels.
k
an integer giving the number of replications.
length
an integer giving the length of the result.
labels
an optional vector of labels for the resulting factor levels.
ordered
a logical indicating whether the result should be ordered or not.

Value

The result has levels from 1 to n with each value replicated in groups of length k out to a total length of length.gl is modelled on the GLIM function of the same name.

See Also

The underlying factor().

Examples

Run this code
## First control, then treatment:
gl(2, 8, labels = c("Control", "Treat"))
## 20 alternating 1s and 2s
gl(2, 1, 20)
## alternating pairs of 1s and 2s
gl(2, 2, 20)

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