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

Deleting Elements from Vectors

Since you've learned how to add elements to a vector, it's only natural to learn how to remove them as well. Everything builds up to this.

To remove an element from a vector, use the - sign before the index of the element you wish to remove. Remember, this action doesn't directly overwrite your vector, so reassignment is usually necessary. To remove multiple elements, you can provide a vector of indices after the - sign. For instance, to remove the third element from the grades vector, the operation would look like this:

Similarly, to eliminate the second and fourth elements from the initial grades vector, you would proceed as follows:

Keep in mind that the operations shown in the examples will not permanently alter the original vectors. To save the changes, you need to reassign the result to the same vector (or to a new one, if needed).

Task

From the previous task, you have the prices vector with the prices of 6 items. Your task is:

Remove the 'Dining chair' item from the prices vector. This item is the fourth in the vector. Save the changes by reassignment.
Display the modified prices vector.

Everything was clear?

Section 2. Chapter 9

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Course Content

R Introduction: Part I

R Introduction: Part I

Deleting Elements from Vectors

Since you've learned how to add elements to a vector, it's only natural to learn how to remove them as well. Everything builds up to this.

To remove an element from a vector, use the - sign before the index of the element you wish to remove. Remember, this action doesn't directly overwrite your vector, so reassignment is usually necessary. To remove multiple elements, you can provide a vector of indices after the - sign. For instance, to remove the third element from the grades vector, the operation would look like this:

Similarly, to eliminate the second and fourth elements from the initial grades vector, you would proceed as follows:

Keep in mind that the operations shown in the examples will not permanently alter the original vectors. To save the changes, you need to reassign the result to the same vector (or to a new one, if needed).

Task

From the previous task, you have the prices vector with the prices of 6 items. Your task is:

Remove the 'Dining chair' item from the prices vector. This item is the fourth in the vector. Save the changes by reassignment.
Display the modified prices vector.

Everything was clear?

Section 2. Chapter 9

toggle bottom row

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