How to set unlabeled values in matrix to zero

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

[Rik]

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]

spy(S)

plots the sparsity pattern of matrix S. Nonzero values are colored while zero values are white

Answer 1

[Rishabh Mishra]

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.