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I have a 5x20 Matrix, I intend to use Matrix Function and Transformations like Fourier Transform which can only be used for Symmetric Matrix. How can I convert the 5x20 Matrix to 20x20 Matrix by Zero Padding?

Soumyadeb Bhattacharjee
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  • can you paste your matrix as text in the question? Also, can pandas & numpy be used in the solution? – moys Oct 10 '19 at 05:16
  • suggest you to give a [minimal reproducible example](https://stackoverflow.com/a/20159305/2970853) and the expected output – henrywongkk Oct 10 '19 at 05:17

3 Answers3

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import numpy as np
a = np.array([[1,1,1,1],[2,2,2,2]])
b=np.zeros((20,20))

result = np.zeros_like(b)
x = 0
y = 0
result[x:a.shape[0],y:a.shape[1]] = a
print(result)

You can use the above logic to implement the padding.

Stan11
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Are you using numpy? If you do you can do it by slicing the arrays

import numpy as np

random_array_5_20 = np.random.rand(5, 20)

padded_array_20_20 = np.zeros((20, 20))

padded_array_20_20[:5, :20] = random_array_5_20
Bruno Vermeulen
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One more approach. Here a is the array that you already have.

import numpy as np
a = np.random.rand(5,20)
za = np.zeros((1, 20))
while a.shape[0] < 20:
    a = np.concatenate((a,za))
moys
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