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NumPy: Create an array of 4,5 shape and to reverse the rows of the said array

NumPy: Array Object Exercise-177 with Solution

Write a NumPy program to create an array of 4,5 shape and to reverse the rows of the said array. After reversing 1st row will be 4th and 4th will be 1st, 2nd row will be 3rd row and 3rd row will be 2nd row.

Pictorial Presentation:

Python NumPy: Create an array of 4,5 shape and to reverse the rows of the said array

Sample Solution:

Python Code:

import numpy as np
array_nums = np.arange(20).reshape(4,5)
print("Original array:")
print(array_nums)
print("\nAfter reversing:")
array_nums[:] = array_nums[3::-1]
print(array_nums)

Sample Output:

Original array:
[[ 0  1  2  3  4]
 [ 5  6  7  8  9]
 [10 11 12 13 14]
 [15 16 17 18 19]]

After reversing:
[[15 16 17 18 19]
 [10 11 12 13 14]
 [ 5  6  7  8  9]
 [ 0  1  2  3  4]]

Python Code Editor:

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Next: Write a NumPy program to replace all the nan (missing values) of a given array with the mean of another array.

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Python: Tips of the Day

Set comprehension:

>>> m = {x ** 2 for x in range(5)}
>>> m
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