To compute the ICC between 2 matrices, you can utilise the ICC Add On from the “Add On Explorer” in MATLAB. You can find it in the “Home” tab mentioned as “Add-Ons”.
You can find out more about it in the file exchange link below:
A simple demo code demonstrating its usage is as follows:
% Setting Seed
rng(1);
% Generate sample data for adjRS1 and adjRS2
adjRS1 = rand(4, 4, 3); % Random numbers between 0 and 1
adjRS2 = rand(4, 4, 3); % Different set of random numbers
% Ensuring the matrices are symmetric and have zeros on the diagonal
for i = 1:3 % Loop through each subject
for j = 1:4 % Loop through each ROI
adjRS1(j, j, i) = 0;
adjRS2(j, j, i) = 0;
for k = j+1:4
adjRS1(k, j, i) = adjRS1(j, k, i);
adjRS2(k, j, i) = adjRS2(j, k, i);
end
end
end
% Concatenating the data
combinedData = cat(4, adjRS1, adjRS2);
% Reshaping it into 2D based on the subjects
data2D = reshape(combinedData, 4*4, 3*2);
% Calculating the ICC
[r, LB, UB, F, df1, df2, p] = ICC(data2D, '1-1')
The output of the above code is as follows:
