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NumPy: Extract first element of the second row and fourth element of fourth row from a given (4x4) array

NumPy: Array Object Exercise-143 with Solution

Write a NumPy program to extract first element of the second row and fourth element of fourth row from a given (4x4) array.

Pictorial Presentation:

NumPy: Extract first element of the second row and fourth element of fourth row from a given (4x4) array

Sample Solution:

Python Code:

import numpy as np
arra_data = np.arange(0,16).reshape((4, 4))
print("Original array:")
print(arra_data)
print("\nExtracted data: First element of the second row and fourth element of fourth row  ")
print(arra_data[[1,3], [0,3]])

Sample Output:

Original array:
[[ 0  1  2  3]
 [ 4  5  6  7]
 [ 8  9 10 11]
 [12 13 14 15]]

Extracted data: First element of the second row and fourth element of fourth row  
[ 4 15]

Python Code Editor:

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Previous: Write a NumPy program to extract all the elements of the first and fourth columns from a given (4x4) array.
Next: Write a NumPy program to extract second and third elements of the second and third rows from a given (4x4) array.

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Python: Tips of the Day

List comprehension:

>>> m = [x ** 2 for x in range(5)]
>>> m
[0, 1, 4, 9, 16]