Extracting array from dictionary value

Question

I am using Python, trying to extract a matrix of distances from a .mat file. It comes in the form of a dictionary "dists" which is the following

print(dists)

enter image description here 1

I want to get the matrix as an array: I tried extracting the value (Python allows it to be converted to an array) but I can't take only the array out, since it says it is 0-dimensional.

arr = np.array(dists[0].values())
print(type(arr))
print(arr)
print(arr[0])

enter image description here 2

It looks like the array is 0-dimensional of the form ([[ ... ]]). How can I extract the 2D matrix?

I looked at this but couldn't figure out how to apply it to my problem. I tried arr[()] but it still thinks arr is a dictionary value rather than an array.

Yudha Styawan · Accepted Answer · 2021-03-01 16:57:54Z

1

Firstly, you need to change dict_values() to list. I hope this example can help you.

import numpy as np
dishes = {'eggs': 2, 'sausage': 1, 'meat': 1, 'spam': np.ones((3,3))}
print(dishes.values())
arr = list(dishes.values())
print(arr)
print(arr[-1])

Terminal Output:

dict_values([2, 1, 1, array([[1., 1., 1.],
       [1., 1., 1.],
       [1., 1., 1.]])])
[2, 1, 1, array([[1., 1., 1.],
       [1., 1., 1.],
       [1., 1., 1.]])]
[[1. 1. 1.]
 [1. 1. 1.]
 [1. 1. 1.]]

answered Mar 1, 2021 at 16:57

Yudha Styawan

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