﻿ NumPy: Extract upper triangular part of a NumPy matrix - w3resource # NumPy: Extract upper triangular part of a NumPy matrix

## NumPy: Array Object Exercise-153 with Solution

Write a NumPy program to extract upper triangular part of a NumPy matrix.

Sample Solution:

Python Code:

``````import numpy as np
num = np.arange(18)
arr1 = np.reshape(num, [6, 3])
print("Original array:")
print(arr1)
result  = arr1[np.triu_indices(3)]
print("\nExtract upper triangular part of the said array:")
print(result)
result  = arr1[np.triu_indices(2)]
print("\nExtract upper triangular part of the said array:")
print(result)
```
```

Sample Output:

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

Extract upper triangular part of the said array:
[0 1 2 4 5 8]

Extract upper triangular part of the said array:
[0 1 4]
```

Pictorial Presentation: 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}
```