How to generate a random number or array from an array in NumPy

To generate a random numberA random number is a number that can not be predicted logically. From this simple definition, it is easy to understand that a random number does not necessarily mean a different number every time. or a random number array from a given array in NumPy, we can use the choice() method.

To generate a random value or a random array from an array in NumPy, we must import the random module.

Let’s have a look at the syntax and code example below to see how we can generate a random array from the given array:

Syntax

The syntax to generate a random array from the given array is:

random.choice(array, size)

Where the array parameter contains the array values, while the size parameter specifies the shape of the array.

Return value

The random.choice(array, size) will return a random array of given size from the array passed as the parameter value.

Code

In the code below, we will create a random array from the given array using the choice() method. The array will be of the shape specified in the arguments of the function.

We use the choice() method to create a 3-by-5 array that contains elements 3, 5, 7, and 9 in random positions.

Let’s have a look at the syntax and code example to see the method to generate a random value from the given array:

Syntax

The syntax to generate a random number from the given array is:

random.choice(array)

Return value

The random.choice(array) will return a random value from the array passed as the parameter value.

Code

By omitting the size parameter from the code used in the first case, we generated just a random number instead of an array from the given array.