error using plot vectors must be same length

% Specify the three inputs 
V = [0:10:200]; % Vehicle speed (mph) 
Ngear = 6; % Gear number 
%Gear Ratio/Efficiency 
gear_level = [1:6]; 
gear_ratio =[4.027 2.364 1.532 1.152 0.852 0.6677]; % [1st 2nd...] 
%Final Drive 
FD_ratio = 2.56; % Final drive ratio 
%Tire 
Rw = 0.25; % Tire radius = 0.25m 
%Unit Conversion 
rps_rpm = 30/pi; % rad/sec to rpm 
mps_mph = 2.237; % m/s to mph 

G_1= [14.16 14.37 14.57 14.77 14.98 15.35 15.89 16.52 17.15 17.7 18.13 18.45 18.7 18.9 19.09]
G_2= [8.383 8.454 8.525 8.595 8.666 8.737 8.808 8.878 9.003 9.162 9.361 9.572 9.798 10.02 10.2]
G_3= [5.556 5.586 5.617 5.647 5.677 5.708 5.738 5.769 5.799 5.829 5.86 5.89 5.94 6.011 6.08]
G_4= [4.178 4.195 4.212 4.229 4.246 4.264 4.281 4.298 4.315 4.332 4.35 4.367 4.384 4.401 4.418]
G_5= [3.096 3.105 3.115 3.124 3.134 3.143 3.153 3.162 3.171 3.181 3.19 3.2 3.209 3.218 3.228]
G_6= [2.421 2.427 2.433 2.439 2.445 2.45 2.456 2.462 2.468 2.473 2.479 2.485 2.491 2.496 2.502]

figure(1) 
plot(V,G_1,'b') 
xlim([0 210]) 
ylim([0 21]) 
hold on plot(V,G_2,'g') 

**and by these "plot" commands it says error using plot vectors not same size**

[Geoff Hayes]

Rachel - V is a 1x21 array and G_1 is a 1x15 array, so the error message makes sense. Should the G_x arrays be of the same size as V?

Answer 1

[Star Strider]

The ‘V’ vector needs to be defined differently.

One possibility is:

V = linspace(0, 200, numel(G_1)); % Vehicle speed (mph) 

defined after the ‘G’ vectors, with the complete code now being:

Ngear = 6; % Gear number 
%Gear Ratio/Efficiency 
gear_level = [1:6]; 
gear_ratio =[4.027 2.364 1.532 1.152 0.852 0.6677]; % [1st 2nd...] 
%Final Drive 
FD_ratio = 2.56; % Final drive ratio 
%Tire 
Rw = 0.25; % Tire radius = 0.25m 
%Unit Conversion 
rps_rpm = 30/pi; % rad/sec to rpm 
mps_mph = 2.237; % m/s to mph 
G_1= [14.16 14.37 14.57 14.77 14.98 15.35 15.89 16.52 17.15 17.7 18.13 18.45 18.7 18.9 19.09];
G_2= [8.383 8.454 8.525 8.595 8.666 8.737 8.808 8.878 9.003 9.162 9.361 9.572 9.798 10.02 10.2];
G_3= [5.556 5.586 5.617 5.647 5.677 5.708 5.738 5.769 5.799 5.829 5.86 5.89 5.94 6.011 6.08];
G_4= [4.178 4.195 4.212 4.229 4.246 4.264 4.281 4.298 4.315 4.332 4.35 4.367 4.384 4.401 4.418];
G_5= [3.096 3.105 3.115 3.124 3.134 3.143 3.153 3.162 3.171 3.181 3.19 3.2 3.209 3.218 3.228];
G_6= [2.421 2.427 2.433 2.439 2.445 2.45 2.456 2.462 2.468 2.473 2.479 2.485 2.491 2.496 2.502];
V = linspace(0, 200, numel(G_1));; % Vehicle speed (mph) 

figure(1) 
plot(V,G_1,'b') 
xlim([0 210]) 
ylim([0 21]) 
hold on 
plot(V,G_2,'g') 
plot(V,G_3,'c') 
plot(V,G_4,'m') 
plot(V,G_5,'k') 
plot(V,G_2,'r') 
hold off

.

[Rachel Belanger]

wow thank you sooo much this fixed it!

[Star Strider]

My pleasure!

If my Answer helped you solve your problem, please Accept it!

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