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

testVariable <- 1
while (testVariable <= 20) { # Ccheck whether testVariable is less than or equal to 20
  if(testVariable %% 3 == 0 && testVariable %% 5 == 0)
  {
    cat(testVariable, "foo bar ")
  } else 
  {
    if(testVariable %% 3 == 0)
    {
      cat(testVariable, "foo ")
    }
    if(testVariable %% 5 == 0)
    {
      cat(testVariable, "bar ")
    }
  }
  testVariable = testVariable + 1 # increment testVariable to move on to the next number to check
}

testVariable <- 1
while (testVariable <= 20) {

  if(testVariable %% 3 == 0 && testVariable %% 5 == 0)
  {
    cat(testVariable, "foo bar ")
  } else 
  {
    if(testVariable %% 3 == 0)
    {
      cat(testVariable, "foo ")
    }
    if(testVariable %% 5 == 0)
    {
      cat(testVariable, "bar ")
    }
  }
  testVariable = testVariable + 1
}

## Explanation

One simple approach is to copy paste the **condition block (line number 4 to 17 in the above code)** $20$ times. However, this method is redundant and lengthy.

We can write a `while` loop that runs $20$ times and for each iteration checks the condition. For this, we make a variable `testVariable` whose value is $1$. Then, in each iteration, we check whether `testVariable` is less than or equal to $20$, and also increment at the end of each iteration.

In this review, we provide a detailed analysis of the solution to this problem.

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

Solution Review: while Loops