This interactive R course covers everything from the basics, variables, and data types to advanced topics, such as recursion, file handling, and S3/S4 classes in R.

In today’s data-driven world, the ability to analyze large datasets is becoming a vital skill across industries. R, one of the most powerful languages for data analysis.
This interactive R course is designed for beginners, with no prior knowledge of R programming required. You will begin with fundamental concepts, such as R variables, data types in R, and basic functions like R print and R cat. As you progress, you will dive into more complex topics, including R vectors, lists, arrays, matrices, and data frames in R programming. You’ll also learn how to perform operations using arithmetic operators in R, relational operators in R, and logical operators in R. Further, the course covers advanced features like if statements in R, switch statements in R, loops in R, and recursion in R. 
Finally, you’ll gain hands-on experience with file handling in R, exception handling with try and except in R, and object-oriented programming using S3 and S4 classes in R.

Learn R

# Problem Statement
Implement a **recursive function** that takes a number $n$ as input, and output the $nth$ term of the Fibonacci series.

The Fibonacci sequence is $0, 1, 1, 2, 3, 5, 8, 13, 21$ where the nth term is the sum of $(n-1)th$ and $(n-2)th$ term.

> The $0th$ term is $0$ and the $1st$ term is $1$. Therefore, the $2nd$ term is $0 + 1 = 1$.


## Input
A `testVariable` that contains the $nth$ term

## Output
The $nth$ term in the Fibonacci series, i.e., the element in the Fibonacci series at index `testVariable`

## Sample Input
```
6
```
## Sample Output
```
8
```


## Test Yourself
Write your code in the given area. If you get stuck, you can look at the solution.

recursiveFibonacci <- function(testVariable) 
{
    # Write your code here
}

recursiveFibonacci <- function(testVariable) 
{
    if(testVariable <= 1) 
    {
        return(testVariable)
    } else 
    {
        return(recursiveFibonacci(testVariable - 1) + recursiveFibonacci(testVariable - 2))
    }
}

Let's test your ability to use recursion.

Introduction to R

R variables

Data Structures in R

Operator in R

Conditional Statements in R

Loops in R

Function in R

Input/Output in R

Exception Handling in R

Classes in R

R Programming Challenges

Conclusion

Exercise 14: Recursion