gl {base}R Documentation

Generate Factor Levels

Description

Generate factors by specifying the pattern of their levels.

Usage

gl(n, k, length = n*k, labels=1: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

# First control, then treatment:
gl(2,8, label=c("Ctnrl","Treat"))
# 20 alternating 1s and 2s
gl(2, 1, 20)
# alternating pairs of 1s and 2s
gl(2, 2, 20)


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