Here are a couple of approaches. First lets create some fake data:
C = {randi(9,3,2),randi(9,2,2),randi(9,4,2)}
C{:}
Method one: CELLFUN and REPELEM:
X = cellfun(@height,C);
Y = 1:numel(X);
D = [vertcat(C{:}),repelem(Y(:),X,1)]
Method two: FOR-loop (modifies the original data):
for k = 1:numel(C)
C{k}(:,3) = k;
end
M = vertcat(C{:})
