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NumPy: Create a random 10x4 array and extract the first five rows of the array and store them into a variable

NumPy: Random Exercise-5 with Solution

Write a NumPy program to create a random 10x4 array and extract the first five rows of the array and store them into a variable.

Sample Solution :

Python Code :

import numpy as np
x = np.random.rand(10, 4)
print("Original array: ")
print(x)
y= x[:5, :]
print("First 5 rows of the above array:")
print(y)

Sample Output:

Original array:                                                        
[[ 0.38593391  0.52823544  0.8994567   0.22097238]                     
 [ 0.16639229  0.74964167  0.58102198  0.2811601 ]                     
 [ 0.56447627  0.42575759  0.71297527  0.91099347]                     
 [ 0.00261548  0.0064798   0.66096109  0.54514293]                     
 [ 0.7216008   0.95815426  0.53370551  0.28116107]                     
 [ 0.16252081  0.26191659  0.40883164  0.60653848]                     
 [ 0.55934457  0.37814126  0.63287808  0.01856616]                     
 [ 0.03788236  0.22705078  0.82024426  0.83019741]                     
 [ 0.31140166  0.43926341  0.38685152  0.92402934]                     
 [ 0.00581032  0.83925377  0.95246879  0.28570894]]                    
First 5 rows of the above array:                                       
[[ 0.38593391  0.52823544  0.8994567   0.22097238]                     
 [ 0.16639229  0.74964167  0.58102198  0.2811601 ]                     
 [ 0.56447627  0.42575759  0.71297527  0.91099347]                     
 [ 0.00261548  0.0064798   0.66096109  0.54514293]                     
 [ 0.7216008   0.95815426  0.53370551  0.28116107]]

Pictorial Presentation:

NumPy Random: Create a random 10x4 array and extract the first five rows of the array and store them into a variable.

Python-Numpy Code Editor:

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Previous: Write a NumPy program to create a 5x5 array with random values and find the minimum and maximum values.
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Python: Tips of the Day

Performs right-to-left function composition:

Example:

from functools import reduce

def tips_compose(*fns):
  return reduce(lambda f, g: lambda *args: f(g(*args)), fns)
add6 = lambda x: x + 6
multiply = lambda x, y: x * y
multiply_and_add_6 = tips_compose(add6, multiply)

print(multiply_and_add_6(10, 3))

Output:

36