gl {base} | R Documentation |
Generate factors by specifying the pattern of their levels.
gl(n, k, length = n*k, labels = seq_len(n), ordered = FALSE)
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. |
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.
The underlying factor()
.
## 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)