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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

Exercise 3: Vectors and Lists

Solution Review: Vectors and Lists

Exercise 4: Arrays and Matrices

Solution Review: Arrays and Matrices

Exercise 5: Data Frames

Solution Review: Data Frames

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 Statements if...else Statements Exercise 8: if/else Statements Solution Review: if/else Statements R ifelse()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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Matrices

Matrices

In this lesson, we will discuss matrices.

Matrices are R objects where elements are arranged in a two-dimensional rectangular layout.

Like arrays, they contain elements of the same data type.

Creating Matrices

A Matrix is created using the matrix() function. The matrix() function takes an atomic vector as input. We can also define how many rows should be in the matrix by setting the nrow argument to a number. Furthermore, we can also set the ncol argument, which tells R how many columns to ...