MATLAB: How to Average across structure

average structure

I have a 14 subject structure (ERP_data.ERP_data); for each subject there is 3D matrix: 32(electrode) x 381(data) x 32(condition); I would like to average the data across subjects with nanmean, so the final matrix will be 32x381x32; thank you for you help!
R

Best Answer

Here's a possible solution I used to solve your problem:
clear; close all;
% This part just creates dummy data similar to yours with the same structure
ERP_data(14) = struct('ERP_data',0);
for n = 1:14
    ERP_data(n) = struct('ERP_data',rand(32,381,32));
end
averagedData = zeros(32,381,32); % Initializes final matrix
for n = 1:32
    for m = 1:381
        for o = 1:32
            dataToAverage = zeros(14,1); % Initializes vector to average
            for p = 1:14
                dataToAverage(p) = ERP_data(p).ERP_data(n,m,o); % Grabs the data point from each subject for the position given by m,n, and o
            end
            averagedData(n,m,o) = nanmean(dataToAverage); % Averages those points and then assigns that value to the position given by m,n, and o in the final matrix
        end
    end
end
Hope that helps!
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