To create a matrix of random integers in python, a solution is to use the numpy function randint, examples:

### 1D matrix with random integers between 0 and 9:

Example of 1D matrix with 20 random integers between 0 and 9:

`>>> import numpy as np`

`>>> A = np.random.randint(10, size=(20))`

`>>> A`

`array([1, 8, 4, 3, 5, 7, 1, 2, 9, 6, 7, 6, 3, 1, 4, 6, 4, 9, 9, 6])`

returns for example:

\begin{equation}

A = \left( \begin{array}{ccc}

1 & 8 & 4 & 3 & 5 & 7 & 1 & 2 & 9 & 6 & 7 & 6 & 3 & 1 & 4 & 6 & 4 & 9 & 9 & 6

\end{array}\right)

\end{equation}

### Matrix (2,3) with random integers between 0 and 9

`>>> import numpy as np`

`>>> A = np.random.randint(10, size=(2, 3))`

`>>> A`

`array([[1, 4, 3],`

`[5, 1, 8]])`

returns for example:

\begin{equation}

A = \left( \begin{array}{ccc}

1 & 4 & 3 \\

5 & 1 & 8

\end{array}\right)

\end{equation}

### Matrix (4,4) with random integers between 0 and 1

`>>> import numpy as np`

`>>> A = np.random.randint(2, size=(4,4))`

`>>> A`

`array([[0, 0, 1, 1],`

`[1, 0, 0, 0],`

`[0, 0, 1, 1],`

`[0, 0, 1, 1]])`

returns for example:

\begin{equation}

A = \left( \begin{array}{cccc}

0 & 0 & 1 & 1 \\

1 & 0 & 0 & 0 \\

0 & 0 & 1 & 1 \\

0 & 0 & 1 & 1

\end{array}\right)

\end{equation}

### Matrix (5,4) with positive and negative integers beetween -10 and 10

`data = np.random.randint(-10,10, size=(5,4))`

returns for example

`array([[ -5, 2, 1, -10],`

`[ -3, -9, -10, 5],`

`[ -6, -2, 7, -3],`

`[ 8, 2, 0, 4],`

`[ -8, 3, -5, 2]])`

### References

numpy.random.randint

Create random list of integers in Python

How to get array of random integers of non-default type in numpy