Exemple de graphique 2D

>> w=logspace(0,3,1000);
>> s=j*w;
>> H=225./(s.*s+3*s+225);
>> AdB=20*log10(abs(H));
>> phase=angle(H)*(180/pi);
>> subplot(2,1,1),semilogx(w,AdB),grid
>> xlabel('w , rad/s'),ylabel('Amplitude , dB')
>> subplot(2,1,2),semilogx(w,phase),grid       
>> xlabel('w , rad/s'),ylabel('Phase , degre')