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How to set unlabeled values in matrix to zero

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Mel
Mel 2020-8-26
关闭： MATLAB Answer Bot 2021-8-20
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 个评论
Rik
Rik 2020-8-26
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 2020-8-26
spy(S)
plots the sparsity pattern of matrix S. Nonzero values are colored while zero values are white

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Rishabh Mishra
Rishabh Mishra 2020-9-3
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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