NumPy: Convert Pandas dataframe to Numpy array with headers

Last update on August 29 2025 12:48:40 (UTC/GMT +8 hours)

Convert Pandas DataFrame to NumPy array with headers.

Write a NumPy program to convert Pandas dataframe to Numpy array with headers.

Sample Solution:

Python Code:

# Importing necessary libraries
import numpy as np
import pandas as pd

# Generating a 12x3 NumPy array with random values
np_array = np.random.rand(12, 3)

# Printing the original NumPy array and its type
print("Original NumPy array:")
print(np_array)
print("Type: ", type(np_array))

# Creating a Pandas DataFrame from a 12x3 NumPy array with random values and labeled columns A, B, C
df = pd.DataFrame(np.random.rand(12, 3), columns=['A', 'B', 'C'])

# Printing the Pandas DataFrame and its type
print("\nPandas DataFrame:")
print(df)
print("Type: ", type(df))

Sample Output:

Original Numpy array:
[[0.18308157 0.32258608 0.39644848]
 [0.31018507 0.08220454 0.40018982]
 [0.63639779 0.34908174 0.39878868]
 [0.74477532 0.4250794  0.12355822]
 [0.61842804 0.78525555 0.95617131]
 [0.17971402 0.03450462 0.3756935 ]
 [0.34533001 0.68281693 0.42670306]
 [0.90444404 0.96700828 0.87172799]
 [0.53261873 0.18419712 0.54780473]
 [0.50476661 0.82657057 0.06935023]
 [0.02482073 0.02318678 0.36032194]
 [0.69001834 0.04285817 0.31768865]]
Type:  <class 'numpy.ndarray'>

Panda's DataFrame: 
           A         B         C
0   0.015583  0.968431  0.943192
1   0.221607  0.704098  0.241200
2   0.466129  0.269226  0.450781
3   0.747222  0.674508  0.686070
4   0.908001  0.399580  0.124778
5   0.540362  0.024179  0.560710
6   0.572349  0.992342  0.347848
7   0.609707  0.786937  0.150088
8   0.162281  0.412158  0.761437
9   0.969180  0.215166  0.769721
10  0.272827  0.817238  0.093650
11  0.196416  0.643602  0.262683
Type:  <class 'pandas.core.frame.DataFrame'>

Explanation:

np_array = np.random.rand(12,3): This line generates a 12x3 NumPy array with random values between 0 and 1 from a uniform distribution and stores in the variable np_array.

df = pd.DataFrame(np.random.rand(12,3),columns=['A','B','C']): Creates a new 12x3 pandas DataFrame ‘df’ with random values between 0 and 1 from a uniform distribution. The columns are labeled 'A', 'B', and 'C'.

Pictorial Presentation:

NumPy: Convert Pandas dataframe to Numpy array with headers

For more Practice: Solve these Related Problems:

Write a NumPy program to convert a Pandas DataFrame to a NumPy array including column headers as the first row.
Create a function that extracts header names from a DataFrame and prepends them to the converted array.
Implement a solution that ensures the resulting NumPy array preserves data types from the DataFrame.
Test the conversion with a DataFrame having mixed data types and verify that headers are correctly included.

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