You can use the following methods to generate random numbers in R:

**Method 1: Generate One Random Number in Range**

#generate one random number between 1 and 20 runif(n=1, min=1, max=20)

**Method 2: Generate Multiple Random Numbers in Range**

#generate five random numbers between 1 and 20 runif(n=5, min=1, max=20)

**Method 3: Generate One Random Integer in Range**

#generate one random integer between 1 and 20 sample(1:20, 1)

**Method 4: Generate Multiple Random Integers in Range**

#generate five random integers between 1 and 20 (sample with replacement) sample(1:20, 5, replace=TRUE) #generate five random integers between 1 and 20 (sample without replacement) sample(1:20, 5, replace=FALSE)

The following examples show how to use each of these methods in practice.

**Method 1: Generate One Random Number in Range**

The following code shows how to generate one random number between 1 and 20:

#generate one random number between 1 and 20 runif(n=1, min=1, max=20) [1] 8.651919

This function generates **8.651919** as the random number between 1 and 20.

**Method 2: Generate Multiple Random Numbers in Range**

The following code shows how to generate five random numbers between 1 and 20:

#generate five random numbers between 1 and 20 runif(n=5, min=1, max=20) [1] 12.507360 6.719675 1.836038 17.685829 16.874723

This function generates five random numbers between 1 and 20.

**Method 3: Generate One Random Integer in Range**

The following code shows how to generate one random integer between 1 and 20:

#generate one random integer between 1 and 20 sample(1:20, 1) [1] 7

This function generates **7 **as the random integer between 1 and 20.

**Method 4: Generate Multiple Random Integers in Range**

The following code shows how to generate five random integers between 1 and 20:

#generate five random integers between 1 and 20 (sample with replacement) sample(1:20, 5, replace=TRUE) [1] 20 13 15 20 5 #generate five random integers between 1 and 20 (sample without replacement) sample(0:20, 5, replace=FALSE) [1] 6 15 5 16 19

Note that if we use **replace=TRUE** then we allow the same integer to be generated more than once.

However, if we use **replace=FALSE **then we do not allow the same integer to be generated more than once.

**Additional Resources**

The following tutorials explain how to perform other common tasks in R:

How to Create a Data Frame with Random Numbers in R

How to Create a Matrix with Random Numbers in R

How to Create a Vector with Random Numbers in R