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Learn Understanding Matrices | Matrices
R Introduction

bookUnderstanding Matrices

Note
Definition

A matrix is a two-dimensional data structure where each element is identified by its row and column position, and elements must be of the same data type.

In R, matrices can be created in different ways. The most common are by merging vectors as rows or by merging them as columns.

Creating Matrix from Rows

You can create a matrix by combining vectors as rows with rbind() function.

Example

12345
row_1 = c(1, 2, 3) row_2 = c(4, 5, 6) # Bind rows into a matrix rbind(row_1, row_2)
copy

This produces a matrix with two rows and three columns.

Creating Matrix from Columns

Alternatively, you can create a matrix by combining vectors as columns with cbind() function.

Example

12345
col_1 = c(1, 2, 3) col_2 = c(4, 5, 6) # Bind columns into a matrix cbind(col_1, col_2)
copy

This produces a matrix with three rows and two columns.

Task

Swipe to start coding

  1. Create two vectors:
    • a with integers from 1 to 4;
    • b with integers from 5 to 8.
      Use the colon (:) sign syntax for a range.
  2. Create and output matrix by merging a and b as rows.
  3. Create and output matrix by merging a and b as columns.

Solution

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SectionΒ 4. ChapterΒ 1
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bookUnderstanding Matrices

Swipe to show menu

Note
Definition

A matrix is a two-dimensional data structure where each element is identified by its row and column position, and elements must be of the same data type.

In R, matrices can be created in different ways. The most common are by merging vectors as rows or by merging them as columns.

Creating Matrix from Rows

You can create a matrix by combining vectors as rows with rbind() function.

Example

12345
row_1 = c(1, 2, 3) row_2 = c(4, 5, 6) # Bind rows into a matrix rbind(row_1, row_2)
copy

This produces a matrix with two rows and three columns.

Creating Matrix from Columns

Alternatively, you can create a matrix by combining vectors as columns with cbind() function.

Example

12345
col_1 = c(1, 2, 3) col_2 = c(4, 5, 6) # Bind columns into a matrix cbind(col_1, col_2)
copy

This produces a matrix with three rows and two columns.

Task

Swipe to start coding

  1. Create two vectors:
    • a with integers from 1 to 4;
    • b with integers from 5 to 8.
      Use the colon (:) sign syntax for a range.
  2. Create and output matrix by merging a and b as rows.
  3. Create and output matrix by merging a and b as columns.

Solution

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SectionΒ 4. ChapterΒ 1
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