Impara What is a Matrix?

Sezione 1. Capitolo 1

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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.


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# Rows
row_1 = c(1, 2, 3)
row_2 = c(4, 5, 6)
# Merge two rows
rbind(row_1, row_2)

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.


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# Columns
col_1 = c(1, 2, 3)
col_2 = c(4, 5, 6)
# Merge two columns
cbind(col_1, col_2)

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

Compito

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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.

Soluzione

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Sezione 1. Capitolo 1

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