(R Example for Citizen Data Scientist & Business Analyst)
R Program to Find the Factorial of a Number Using Recursion
In this example, you’ll learn to find the factorial of a number using a recursive function.
The factorial of a number is the product of all the integers from 1 to the number.
For example, the factorial of 6 (denoted as 6!) as
1 * 2 * 3 * 4 * 5 * 6 = 720
Factorial is not defined for negative numbers and the factorial of zero is one, 0! = 1.
In this example, the factorial of a number is calculated using a recursive function. However, you can also calculate it without the recursive function.
Example: Find Factorial of a number using recursion
recur_factorial <- function(n) {
if(n <= 1) {
return(1)
} else {
return(n * recur_factorial(n-1))
}
}
Output
> recur_factorial(5) [1] 120
Here, we ask the user for a number and use recursive function recur_factorial()
to compute the product upto that number.
Lets suppose the user passes 5 to the function.
Inside the recur_factorial()
, the number 5 is multiplied to the factorial of (5 – 1 = 4).
4 is multiplied again to the factorial of (4 – 1 = 3). This goes on until the number reaches 1.
Now, all previous functions of 2, 3, 4 and 5 returns the result one by one giving you the final result 1*2*3*4*5
, which equals 120.
Python Examples for Beginners: Python Code to Find the Factorial of a Number
R Examples for Beginners – R Program to Find the Factorial of a Number Using Recursion
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