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

Labeling Vectors

Now that you're familiar with creating vectors, let's apply them to store and label valuable information, such as grades on a scale from 1 to 100. However, the grades alone may not be self-explanatory to someone else.

Suppose the grades are as follows:

Subject	Grade
Math	80
Physics	75
English	95
Literature	100

While you know how to create a vector with grades, the next step is labeling those values with their corresponding subjects. This can be done by assigning a vector of names to names(vector), where vector is your original vector that you wish to label.

Here's how you can do that:

Here, c('Math', 'Physics', 'English', 'Literature') is the vector of names (labels). As you can see, using this approach, we can present the information more clearly.

Task

Imagine you manage a local furniture store. You have a list of items and their respective prices, as shown below:

Item	Price
Sofa	$340
Armchair	$150
Dining table	$115
Dining chair	$45
Bookshelf	$160

Your task is to store the prices in a vector named prices and label each price with the corresponding item.

Construct a vector of prices and store it in the variable prices.
Use the variable items to assign names to the elements in the prices vector.
Display the prices vector.

Everything was clear?

Section 2. Chapter 6

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Course Content

R Introduction: Part I

R Introduction: Part I

Labeling Vectors

Now that you're familiar with creating vectors, let's apply them to store and label valuable information, such as grades on a scale from 1 to 100. However, the grades alone may not be self-explanatory to someone else.

Suppose the grades are as follows:

Subject	Grade
Math	80
Physics	75
English	95
Literature	100

While you know how to create a vector with grades, the next step is labeling those values with their corresponding subjects. This can be done by assigning a vector of names to names(vector), where vector is your original vector that you wish to label.

Here's how you can do that:

Here, c('Math', 'Physics', 'English', 'Literature') is the vector of names (labels). As you can see, using this approach, we can present the information more clearly.

Task

Imagine you manage a local furniture store. You have a list of items and their respective prices, as shown below:

Item	Price
Sofa	$340
Armchair	$150
Dining table	$115
Dining chair	$45
Bookshelf	$160

Your task is to store the prices in a vector named prices and label each price with the corresponding item.

Construct a vector of prices and store it in the variable prices.
Use the variable items to assign names to the elements in the prices vector.
Display the prices vector.

Everything was clear?

Section 2. Chapter 6

toggle bottom row

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