R: Generate Factor Levels (original) (raw)
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 oflength.
gl is modelled on the GLIM function of the same name.
See Also
The underlying [factor](../../base/help/factor.html)().
Examples
## 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)
[Package _base_ version 4.6.0 Index]