Вивчайте Understanding Matrices

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)

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)

This produces a matrix with three rows and two columns.

Завдання

Swipe to start coding

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.
Create and output matrix by merging a and b as rows.
Create and output matrix by merging a and b as columns.

Рішення

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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)

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)

This produces a matrix with three rows and two columns.

Завдання

Swipe to start coding

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.
Create and output matrix by merging a and b as rows.
Create and output matrix by merging a and b as columns.

Рішення

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Секція 1. Розділ 27

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