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please help me with this

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rami shaker
rami shaker on 29 Dec 2020
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Commented: rami shakeron 29 Dec 2020
我绘制的图:
beta = 0;% Pitch angle
ind2 = 1;
forlambda=0.1:0.01:11.8
lambdai(ind2) = (1./((1./(lambda-0.02.*beta)+ (0.003./(beta^3+1)))));
Cp(ind2)=0.73.*(151./lambdai(ind2)-0.58.*beta-0.002.*beta^2.14-13.2).*(exp(-18.4./lambdai(ind2)));
ind2=ind2+1;
end
tab_lambda=[0.1:0.01:11.8];
% Kopt for MPPT (maximum power point tracking)
Cp_max=0.44;
lambda_opt=7.2;
kopt = ((0.5*ro*pi*(Radius^5)*Cp_max)/(lambda_opt^3));
figure
subplot(1,3,3)
plot(tab_lambda,Cp,'linewidth',1.5)
xlabel('lambda','fontsize',14)
ylabel('Cp','fontsize',14)
Now, I want the graph to be like this:
What I must change in the code to plot this new graph???
Please help me.
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rami shaker
rami shaker on 29 Dec 2020
Radius = 46;
ro = 1.225;

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Answers (2)

艾伦·史蒂文斯
艾伦·史蒂文斯 on 29 Dec 2020
Edited:艾伦·史蒂文斯 on 29 Dec 2020
Simply insert
hold
xvals = [0 7.2 7.2]; yvals = [0.36 0.36];
plot(xvals,yvals,'--')
after your plot command (though the peak of the first curve you showed is higher than 0.36).
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rami shaker
rami shaker on 29 Dec 2020
I want that the curve will be like this (if you understand the issue)

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Steven Lord
Steven Lord on 29 Dec 2020
Ran in:
This doesn't quite do exactly what you want but it's close.
% Define the curve
x = 0:0.25:10;
y = 50-(x-4).^2;
% Plot it
plot(x, y);
holdon
%的豌豆k
[maxY, maxYLoc] = max(y);
% Plot the dashed lines and the "x marks the spot"
xline(x(maxYLoc),'--')
yline(maxY,'--')
plot(x(maxYLoc), maxY,'x')
% Set the limits so there's room to see the horizontal dashed line
ylim([0 60])
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rami shaker
rami shaker on 29 Dec 2020
beta = 0;% Pitch angle
ind2 = 1;
forlambda=0.1:0.01:11.8
lambdai(ind2) = (1./((1./(lambda-0.02.*beta)+ (0.003./(beta^3+1)))));
Cp(ind2)=0.73.*(151./lambdai(ind2)-0.58.*beta-0.002.*beta^2.14-13.2).*(exp(-18.4./lambdai(ind2)));
ind2=ind2+1;
end
tab_lambda=[0.1:0.01:11.8];
% Kopt for MPPT (maximum power point tracking)
Cp_max=0.44;
lambda_opt=7.2;
kopt = ((0.5*ro*pi*(Radius^5)*Cp_max)/(lambda_opt^3));
figure
subplot(1,3,3)
plot(tab_lambda,Cp,'linewidth',1.5)
xlabel('lambda','fontsize',14)
ylabel('Cp','fontsize',14)
i want to modify this code to plot the second curve with peak of 0.36 at x=7.2

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