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Learn R from Scratch

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Getting Started

Why R?Hello World

Variables

Data Types Basic Methods for Handling Variables Exercise 1: Variables Solution Review: Variables All About Strings Difference Between print() and cat()Exercise 2: Strings Solution Review: Strings Test Your Knowledge 1

Exploring R Objects

Vectors Lists Exercise 3: Vectors and Lists Solution Review: Vectors and Lists Arrays Matrices Exercise 4: Arrays and Matrices Solution Review: Arrays and Matrices Data Frames Exercise 5: Data Frames Solution Review: Data Frames Factors Test Your Knowledge 2

R Operators and Notation

Arithmetic Operators Exercise 6: Arithmetic Operators Solution Review: Arithmetic Operators Relational Operators Logical Operators Exercise 7: Relational and Logical Operators Solution Review: Relational and Logical Operators Test Your Knowledge 3

Conditional Statements

if...else Statements

Exercise 8: if/else Statements

Solution Review: if/else Statements

Exercise 9: ifelse()

Solution Review: ifelse()

switch Statements

Test Your Knowledge 4

Loops

Introduction to Loops while Loops Exercise 10: while Loops Solution Review: while Loops for Loops Exercise 11: for Loops Solution Review: for Loops repeat Loops Test Your Knowledge 5

Functions

Creating Functions Exercise 12: Creating Functions Solution Review: Creating Functions Returning from a Function Exercise 13: Returning from a Function Solution Review: Returning from a Function Nested Functions Recursion Exercise 14: Recursion Solution Review: Recursion Test Your Knowledge 6

Input/Output

Entering Data from the Keyboard Handling TXT files Exercise 16: Handling TXT files Solution Review: Handling TXT files Handling CSV files Exercise 17: Handling CSV files Solution Review: Handling CSV file Test Your Knowledge 7

Exception Handling

Introduction to Exception Handling Try Catch Exercise 18: Try Catch Solution Review: Try Catch Other Methods for Exception Handling Test Your Knowledge 8

Classes

What is a Class and its Types?

Fun Challenges

Challenge 1: Append Hearts Solution Review: Append Hearts Challenge 2: Find Mean and Median Solution Review: Find Mean and Median Challenge 3: Find the Highest Achiever Solution Review: Find the Highest Achiever

Conclusion

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R ifelse()

R ifelse()

Here, we are going to have a look at the method "ifelse()" provided by R language.

Most of the programs written in R language involve some kind of manipulation of vectors. Vectors are basic R Objects.

Use of `ifelse()` Function

Now, imagine a case where we have to write if...else statement for each element present in a vector. This task can be easily and efficiently coded using ifelse(). It is the vector equivalent form of the ...