...
result = result + 2*sum(f(y(3:2:end-21))); % Regner for de odde y-ene
result = result + 4*sum(f(y(2:2:end-2))); % Regner for de pare y-ene
...
...
result = result + 2*sum(f(y(3:2:end-21))); % Regner for de odde y-ene
result = result + 4*sum(f(y(2:2:end-2))); % Regner for de pare y-ene
...