function bode=traceBode(A0,B0,A1,B1,fmin,fmax)
if B0 == 0 & B1 == 0
    disp('Erreur: B0=B1=0')
else
    f=fmin:100:fmax
    G=20.*log(((A0+A1.*f.*j)./(B0+B1.*f.*j)))
    semilogx(f,G),title('Diagramme de Bode'),xlabel('f(Hz)'),ylabel('G(dB)'),grid
end