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Log and natural Logarithmic value of a column in Pandas – Python

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  • Last Updated : 28 Jul, 2020

Log and natural logarithmic value of a column in pandas can be calculated using the log(), log2(), and log10() numpy functions respectively. Before applying the functions, we need to create a dataframe.

Code:

Python3




# Import required libraries
import pandas as pd
import numpy as np
   
# Dictionary
data = {
     'Name': ['Geek1', 'Geek2',
             'Geek3', 'Geek4'],
   'Salary': [18000, 20000
             15000, 35000]} 
  
# Create a dataframe
data = pd.DataFrame(data,
                    columns = ['Name'
                               'Salary'])
  
# Show the dataframe
data

Output: 
 

dataframe

Logarithm on base 2 value of a column in pandas: 

After the dataframe is created, we can apply numpy.log2() function to the columns. In this case, we will be finding the logarithm values of the column salary. The computed values are stored in the new column “logarithm_base2”. 

Code:

Python3




# Calculate logarithm to base 2 
# on 'Salary' column
data['logarithm_base2'] = np.log2(data['Salary'])
  
# Show the dataframe
data    

Output : 

calculate log base 2 of salary column

Logarithm on base 10 value of a column in pandas: 

To find the logarithm on base 10 values we can apply numpy.log10() function to the columns. In this case, we will be finding the logarithm values of the column salary. The computed values are stored in the new column “logarithm_base10”. 

Code:

Python3




# Calculate logarithm to 
# base 10 on 'Salary' column
data['logarithm_base10'] = np.log10(data['Salary'])
  
# Show the dataframe
data

Output :
 

calculate log base 10 of salary column

Natural logarithmic value of a column in pandas:

To find the natural logarithmic values we can apply numpy.log() function to the columns. In this case, we will be finding the natural logarithm values of the column salary. The computed values are stored in the new column “natural_log”. 

Code:

Python3




# Calculate natural logarithm on
# 'Salary' column
data['natural_log'] = np.log(data['Salary'])
  
# Show the dataframe
data    

Output : 
 

 


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