| 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)