﻿ NumPy: Create a random 10x4 array and extract the first five rows of the array and store them into a variable - w3resource

# 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:

Python-Numpy Code Editor:

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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
```36