For a 3D matrix, there's no standard matrix multiplication operation.
Assuming you want to square each element of a 3D matrix:
% Generate a 3D matrix u of size 101x101x101 with dummy data
u = rand(101, 101, 101); % For example, using random numbers
% Calculate u^2 element-wise
u_squared = u .* u;
% Display some of the squared values to verify
disp(u_squared(1:2, 1:2, 1:2)); % Display a small portion to check
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