clear all, close all measured_airspeed=[7 8 9 10 11 12 14 16 18 20 22 24 26 28 30]*3.6; %in km/h measured_power=[36.28589708 34.42375852 35.50096102 33.3665519 36.21718883 32.94772362 47.17750566 61.33935748 81.75780878 100.4778223 122.7823714 148.3755128 189.4795868 223.162757 255.8001442]; %in Watt N_v=300; %Anzahl der untersuchten Geschwindigkeitspunkte v_a_max=150; %Maximaler airspeed in km/h v_a = linspace(1,v_a_max,N_v); interp_power = interp1(measured_airspeed, measured_power, v_a,'spline'); % %Interpolierte Effizienzkurve plotten plot(measured_airspeed, measured_power, 'linewidth', 3) hold on plot(v_a, interp_power) hold off legend('Rohdaten','Interpolierte Daten' ) xlabel('airspeed/ km/h') ylabel('Power/ Watt') ylim([0 270])