Course Content

R Introduction: Part II

1. Matrices

What is a Matrix?matrix() Function Transposing Matrix Indexation Namings Operation with Matrices Sales and Revenue

2. Data Frames

What is a Data Frame?data.frame() Function Columns Accessors Logical Indexing Manipulating Columns Manipulating Rows Data Extraction

3. Lists

What is a List?Namings Extracting List Elements Modifying

R Introduction: Part II

What is a Matrix?

A matrix is a two-dimensional data structure in R, which means that every matrix element can be characterized by its position among rows and columns. Matrices in R can contain data of only one type, i.e., a matrix can not contain numbers and text simultaneously.

There are several ways to create a matrix in R. On one side, you can 'merge' two rows; on the other, you can 'merge' two columns. Let's consider each method separately. The first one is the rbind() function. Function name comes from Rows *Bind - this function connects vectors as rows.

As you can see, this matrix has two rows and three columns (since each row has three values). Another way - is to use cbind() function. Likewise, the previous function, name of this function comes from Columns Bind. Let's look at the example.

As you can see, this matrix has two columns and three rows (since each column has three values).

Task

Practice creating matrices by yourself using both methods!

Create two vectors: a with integers from 1 to 4, and b with integers from 5 to 8 using the colon : sign.
Create and output matrix by merging a and b as rows.
Create and output matrix by merging a and b as columns.

_{Once you've completed this task, click the button below the code to check your solution.}

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Section 1. Chapter 1

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