﻿ NumPy: Create an 1-D array of 20 elements - w3resource # NumPy: Create an 1-D array of 20 elements

## NumPy: Array Object Exercise-175 with Solution

Write a NumPy program to create an 1-D array of 20 elements. Now create a new array of shape (5, 4) from the said array, then restores the reshaped array into a 1-D array.

Sample Solution:

Python Code:

``````import numpy as np
array_nums = np.arange(0, 40, 2)
print("Original array:")
print(array_nums)
print("\nNew array of shape(5, 4):")
new_array = array_nums.reshape(5, 4)
print(new_array)
print("\nRestore the reshaped array into a 1-D array:")
print(new_array.flatten())
```
```

Sample Output:

```Original array:
[ 0  2  4  6  8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38]

New array of shape(5, 4):
[[ 0  2  4  6]
[ 8 10 12 14]
[16 18 20 22]
[24 26 28 30]
[32 34 36 38]]

Restore the reshaped array into a 1-D array:
[ 0  2  4  6  8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38]
```

Python Code Editor:

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## Python: Tips of the Day

Set comprehension:

```>>> m = {x ** 2 for x in range(5)}
>>> m
{0, 1, 4, 9, 16}
```