Python math.erf() Method with Examples

math.erf() Method in Python:

The math.erf() method returns a number’s error function.

This method accepts values ranging from – inf to + inf and returns a value ranging from – 1 to + 1.

Syntax:

math.erf(x)

Parameters

x: This is Required. It is a number used to calculate the error function of

Return Value:

Returns a float value that represents a number’s error function.

Examples:

Example1:

Input:

Given Number = 0.5

Output:

The given number's { 0.5 } error function =  0.5204998778130465

Example2:

Input:

Given Number = -4.5

Output:

The given number's { -4.5 } error function =  -0.9999999998033839

math.erf() Method with Examples in Python

• Using Built-in Functions (Static Input)
• Using Built-in Functions (User Input)

Method #1: Using Built-in Functions (Static Input)

Approach:

• Import math module using the import keyword.
• Give the number(angle) as static input and store it in a variable.
• Pass the given  as an argument to the math.erf() function to get the given number’s error function.
• Store it in another variable.
• Print the error function of the given number.
• The Exit of the Program.

Below is the implementation:

# Import math module using the import keyword
import math
# Give the number as static input and store it in a variable.
gvn_numb = 0.5
# Pass the given number as an argument to the math.erf() function to get
# the given number's error function.
# Store it in another variable.
rslt = math.erf(gvn_numb)
# Print the error function of the given number.
print("The given number's {", gvn_numb, "} error function = ", rslt)

Output:

The given number's { 0.5 } error function =  0.5204998778130465

Similarly, try for other numbers.

import math
gvn_numb = -15.2
rslt = math.erf(gvn_numb)
print("The given number's {", gvn_numb, "} error function = ", rslt)

Output:

The given number's { -15.2 } error function =  -1.0

Method #2: Using Built-in Functions (User Input)

Approach:

• Import math module using the import keyword.
• Give the number as user input using the float(input()) function and store it in a variable.
• Pass the given number as an argument to the math.erf() function to get the given number’s error function.
• Store it in another variable.
• Print the error function of the given number.
• The Exit of the Program.

Below is the implementation:

# Import math module using the import keyword
import math
# Give the number as user input using the float(input()) function and store it in a variable.
gvn_numb = float(input("Enter some random number = "))
# Pass the given number as an argument to the math.erf() function to get
# the given number's error function.
# Store it in another variable.
rslt = math.erf(gvn_numb)
# Print the error function of the given number.
print("The given number's {", gvn_numb, "} error function = ", rslt)

Output:

Enter some random number = -4.5
The given number's { -4.5 } error function = -0.9999999998033839