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How to set unlabeled values in matrix to zero

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Mel
Mel on 26 Aug 2020
Closed: MATLAB Answer Bot on 20 Aug 2021
Hello everyone!
I have a 1536 x 2048 matrix. For visualization purposes I preprocessed 1Mio random data points and labeled them. Now I want to plot the previous matrix, but set the values of the other 2 Mio data points to zero in order to make the processed ones visible. Is this even possible? I'd be super grateful if you guys could help.
Thank you in advance
  2 Comments
Rik
Rik on 26 Aug 2020
Is this possible? Probably. If you want help you will either have to provide instructions on how to hack your computer or explain what you did.
Have a read here and here. It will greatly improve your chances of getting an answer.
Rafael Hernandez-Walls
Rafael Hernandez-Walls on 26 Aug 2020
spy(S)
plots the sparsity pattern of matrix S. Nonzero values are colored while zero values are white

Answers (1)

Rishabh Mishra
Rishabh Mishra on 3 Sep 2020
Assuming the name of the matrix variable as 'mat'
To set unlabeled matrix values to 0, consider the pseudocode below:
for i = 1:1536
for j = 1:2048
If mat(i)(j) is unlabeled
Set mat(i)(j) to 0
end
end
To visualize sparsity pattern of the matrix, use the code below.
>> spy(mat)
For more information on ‘spy()’ function, refer this link.

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