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 = 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.

The underlying factor().

### 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 4.2.0 Index]