python cmath.log10() Function

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The Python cmath.log10() function is used to acquire the logarithm of the given complex number with base-10. If we pass a string value as a parameter to this function a TypeError will be generated.

Syntax

Following is the basic syntax for the cmath.log10() function −

cmath.log10(z)

Parameters

This function accepts a numeric expression of a complex number as a parameter.

Return Value

This method returns base-10 logarithm of z from z>(0,-).

Example 1

Let us discuss the basic Python program of cmath.log10() value with complex number.

import cmath
x=2+3j
y=cmath.log10(x)
print(y)

Output

When we run the above program,it produces following result −

(0.5569716761534184+0.42682189085546657j)

Example 2

In the below code we are creating tuple and list of numbers. Then, in the log10 method, we will find the logarithm of the value at index 2 in the tuple and at index 3 in the list using cmath.log10().

import cmath
Tuple = (6,11,-24,35,-65)
List = [5,15,-25,45.67,-75]
print('The log10() value of Tuple is:',cmath.log10(Tuple[2]))
print('The log10() value of List is:',cmath.log10(List[3]))

Output

The above program generates the following output−

The log10() value of Tuple is: (1.380211241711606+1.3643763538418412j)
The log10() value of List is: (1.6596310116070006+0j)

Example 3

If we pass string as an argument then this method returns TypeError. In the below code we are acquiring the cmath.log10() value of a string.

import cmath
y='TutorialsPoint'
print('The log10() value of string is:',math.log10(y))

Output

We will get the output as shown in the below while executing the code −

Traceback (most recent call last):
  File "/home/cg/root/83980/main.py", line 6, in <module>
    print('The log10() value of string is:',cmath.log10(y))
TypeError: must be real number, not str

Example 4

If we are passing zero as an argument to this method ,it raises ValueError.

import cmath
x=0.0
res=cmath.log10(x)
print('The result for x is:',res)

Output

The output obtained is as follows −

Traceback (most recent call last):
  File "/home/cg/root/91202/main.py", line 3, in <module>
    res=cmath.log10(x)
ValueError: math domain error