MATLAB: Save values in array

Question

I have

A={[1,6,3,2],[3,5,6]};
all_el =[];
for i=1:length(A)
    all_el(end)=A{i}
end

I want to have this result

all_ell=[1,2,3,5,6]

Answer 1

all_el = unique([A{:}]);