plotting 2 y-axis in one graph

Hi,

I am trying to plot 2 y-axis in 1 x-axis ( as shown as the picture), but my coding seems to have error in plotting it.

I want to plot (TAS, power available) x2 and (TAS, power required) x2

I also have error in labelling the y-axis.

U = TAS;
W = P_available_22K;
X = P_required_22K;
Y = P_available_26K;
Z = P_required_26K;

yyaxis left
% POWER AVAILABLE 22K VS TAS 
plot(U([1:37]),W([1:37]), 'Color', 'r', 'Linestyle', '--', 'linewidth', 1.0); 
hold on; 
% POWER AVAILABLE 26K VS TAS 
plot(U([1:42]),Y([1:42]), 'Color', 'b', 'Linestyle', '-', 'linewidth', 1.0); 

yyaxis right
% POWER REQUIRED 22K VS TAS 
plot(U([1:37]),X([1:37]), 'Color', 'r', 'Linestyle', '--', 'linewidth', 1.0); 
hold on; 
% POWER REQUIRED 26K VS TAS 
plot(U([1:42]),Z([1:42]), 'Color', 'b', 'Linestyle', '-', 'linewidth', 1.0); 

xlabel('TAS (m/s)','FontSize',14, 'fontweight', 'bold', 'color', '[0 0 1]')
ylabel('Power Available (W)', '','FontSize',14, 'fontweight', 'bold', 'color', '[0 0 1]')
ylabel('Power Required (W)', '','FontSize',14, 'fontweight', 'bold', 'color', '[0 0 1]')
title('Power Available Vs Power Required','FontSize',16, 'fontweight', 'bold', 'color', '#000000')
legend('Power Available 22K','Power Available 26K', 'Power required 22K','Power required 26K','Location','Bestoutside')
grid on
grid minor

Answer 1

[Dyuman Joshi]

The ylabel() call for the left y-axis should be done before changing the y-axis to right.

Refer to this example - https://in.mathworks.com/help/matlab/ref/yyaxis.html#bunqz6e-1