R Introduction: Part I

R Introduction: Part I

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1. Basic Syntax and Operations

In the initial section, you’ll dive into the foundational elements of R, such as generating output and performing elementary operations. This section will conclude with an exploration of the theory behind variables.

Basic Arithmetic

Using the print() Function

Integer Division and Remainders

Revenue Calculation

Assignment Operators

2. Basic Data Types and Vectors

You’ll become familiar with the vector class in R, which also handles individual values. Here, you’ll delve into the primary data types for singular values and learn how to manage multiple values of the same type simultaneously.

Type Conversion

Labeling Vectors

Indexing in Vectors

Modifying Vectors

Deleting Elements from Vectors

Arithmetic Operations with Vectors

3. Factors

Factors, also known as categorical variables, are prevalent in the real world. Examples include blood types, currencies, nationalities, and brands. Unlike numerical variables, factors have a limited set of possible values.

What is a Factor?

Indexing in Factors

Counting Values

Grouping Numeric Data

Numbers

In the previous section, we observed that the number 10 was identified as a double even though it is an integer. Let's delve into this peculiarity.

R can categorize numeric values into several types, which are:

double - representing real numbers;
integer - for whole numbers;
complex - for numbers with both a real and an imaginary part.

In R, the default type for numbers is double, which means double-precision floating-point numbers.

To have R recognize 10 as an integer instead of a double, you can append L to the number. Here’s how you can do it:

Differentiating between 10 and 10L is important because of how memory is utilized — integers take up less space.

Task

Assign the current year's numerical value to a variable named year, and ensure that it is of integer type by appending L.
Determine and display the type of the year variable:

Everything was clear?

Section 2. Chapter 2

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Course Content

R Introduction: Part I

R Introduction: Part I

Numbers

In the previous section, we observed that the number 10 was identified as a double even though it is an integer. Let's delve into this peculiarity.

R can categorize numeric values into several types, which are:

double - representing real numbers;
integer - for whole numbers;
complex - for numbers with both a real and an imaginary part.

In R, the default type for numbers is double, which means double-precision floating-point numbers.

To have R recognize 10 as an integer instead of a double, you can append L to the number. Here’s how you can do it:

Differentiating between 10 and 10L is important because of how memory is utilized — integers take up less space.

Task

Assign the current year's numerical value to a variable named year, and ensure that it is of integer type by appending L.
Determine and display the type of the year variable:

Everything was clear?

Section 2. Chapter 2

toggle bottom row

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