not getting legend in the plot and not getting y axis name

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Sourav singh 2021-4-5

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/792767-not-getting-legend-in-the-plot-and-not-getting-y-axis-name

评论： Walter Roberson 2021-4-6

sigma=0.047193;
    V_tip=180;
    W=180;
    Cd_avg=0.01;
    R=2.235;
    %R1=2.68;
    Rv=80.529;                                                            %rotational velocity
    A=pi*R.^2;
    rho=1.225;
    Ct=0.0:0.0001:0.12;                                 
for i = 1:numel(Ct)
    Vs = -(sqrt(Ct./2)+((sigma*Cd_avg)./(8*Ct))).*(Rv*R);                 %descent speed
    Cd_eq =((2*W)./(rho.*A.*(Vs).^2));                                   % equivalent drag coefficient of the rotor in steady descent
    V_autorotationaldescent = -(sqrt(Ct./2)+((sigma*Cd_avg)./(8*Ct)));    % steady autorotational descent rate
   Vs1=  -(sqrt(Ct./2)+((sigma*Cd_avg)./(8*Ct))).*(Rv*0.625*R);    
end
figure(1)
hold on
plot(Ct,-Vs,'r-',Ct,-Vs1,'g');
xlabel("C_t");
ylabel("V_s");
title("Descent Rate vs. Thrust Coefficient");
legend({'Normal Diameter','Diameter x 1.25'},'FontSize',12,'Location','northeast','Orientation','horizontal')
figure(2)
plot(Ct,Cd_eq,'r-',Ct,-V_autorotationaldescent,'b')
xlabel('C_t')
ylabel('Cd_eq')
addaxislabel(2,'steady autorotational descent')
legend({'Cd_(eq)','V_s/\OmegaR'},'FontSize',14,'Location','northeast','Orientation','horizontal')
hold off
% sir i got the plot no.1 with legend and axis name and all. 
% having problem in figure 2 not getting lengend and not getting 2 y axis
% name, help sir

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Sourav singh 2021-4-5

i so a tutorial on youtube regarding " how to add 2 y axis name in matlab" and in that video the person used that command

Walter Roberson 2021-4-6

Well, it is not part of MATLAB itself, so to use it in MATLAB you need to install addaxislabel from somewhere such as the File Exchange contribution I linked to.

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