Python math.nextafter() Method

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The Python math.nextafter() method is used to calculate the next representable floating-point number after a given floating-point value in the specified direction.

It returns the next floating-point value following the first argument in the direction of the second argument.

Syntax

Following is the basic syntax of the Python math.nextafter() method −

math.nextafter(x, y)

Parameters

This method accepts the following parameters −

• x − It is the starting point (a floating-point number).

• y − It is the direction (another floating-point number).

Return Value

The method returns the next representable floating-point value after "x" in the direction of "y".

Example 1

In the following example, we are finding the next representable floating-point value after "2.0" in the direction of "3.0" −

import math
result = math.nextafter(2.0, 3.0)
print("The result obtained is:",result)         

Output

The output obtained is as follows −

The result obtained is: 2.0000000000000004

Example 2

Here, we are finding the next representable floating-point value after "2.0" in the negative direction of "1.0" −

import math
result = math.nextafter(2.0, 1.0)
print("The result obtained is:",result)  

Output

Following is the output of the above code −

The result obtained is: 1.9999999999999998

Example 3

Now, we are finding the next representable floating-point value after "0.0" in the direction of "1.0". The result is the smallest positive normalized floating-point number −

import math
result = math.nextafter(0.0, 1.0)
print("The result is:",result)  

Output

We get the output as shown below −

The result obtained is: 5e-324

Example 4

In this example, we use variables "x" and "y" to store the values "1.5" and "2.5" respectively. We then find the next representable floating-point value after "1.5" in the direction of "2.5" −

import math
x = 1.5
y = 2.5
result = math.nextafter(x, y)
print("The result obtained is:",result)  

Output

The result produced is as shown below −

The result obtained is: 1.5000000000000002