# Generate Factors with specified Levels in R Programming – gl() Function

`gl()` function in R Language is used to generate factors by specifying the pattern of their levels.

Syntax:
gl(x, k, length, labels, ordered)

Parameters:
x: Number of levels
k: Number of replications
length: Length of result
labels: Labels for the vector(optional)
ordered: Boolean value to order the levels

Example 1:

 `# R Program to generate factors ` ` `  `# Creating a factor ` `# using gl() function ` `x1 <``-` `gl(``2``, ``5``) ` ` `  `# gl() function with ` `# length specified ` `x2 <``-` `gl(``3``, ``4``, ``12``) ` ` `  `# Printing the factors ` `print``(x1) ` `print``(x2) `

Output:

```  1 1 1 1 1 2 2 2 2 2
Levels: 1 2
 1 1 1 1 2 2 2 2 3 3 3 3
Levels: 1 2 3
```

Example 2:

 `# R Program to generate factors ` ` `  `# gl() function with ` `# length and labels specified ` `x1 <``-` `gl(``3``, ``4``, ``12``, label ``=` `letters[``1``:``12``]) ` ` `  `# gl() function with ` `# length, label and order specified ` `x2 <``-` `gl(``3``, ``4``, ``12``, label ``=` `letters[``1``:``12``], ordered ``=` `T) ` ` `  `# Printing the factors ` `print``(x1) ` `print``(x2) `

Output:

```  a a a a b b b b c c c c
Levels: a b c d e f g h i j k l
 a a a a b b b b c c c c
Levels: a < b < c < d < e < f < g < h < i < j < k < l
```
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