MATLAB: Converting 3D data to 2D

3d to 2d

I have a 50×4 matrix with the columns being x, y, z, and a value. I want to average each x,y point through the z to convert my 3D data to a 2D.

Best Answer

So, you want to ignore the z, and average the values for each specific combination of (x,y)?

xyzv = [1 1 1 10 ; 1 1 2 20 ; 1 2 3 30 ; 1 2 5 40 ; 2 2 4 10]  % test data
[xy,~,j] = unique(xyzv(:,[1 2]),'rows')  % unique combinations of (x,y)
xyv = [xy accumarray(j,xyzv(:,4),[size(xy,1),1],@mean)]  % ignore z, average v

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MATLAB: Average data along z

[uxy, ~, uidx] = unique([x(:), y(:)], 'rows');
avgv = accumarray(uidx, v(:), [], @mean);
output = [uxy, avgv];

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