A = [1,2,3;4,5,6];

C(1,:) = {'force','mass','accleration'};
C(2,:) = {'N','Kg','m/s^2'};

C(3,:) = num2cell(A(1,:));
C(4,:) = num2cell(A(2,:));
T = cell2table(C)

writetable(T,'tabledata.dat')