Plot all if condition with for loop

Question

Julien Daltin 2021-4-29

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/816810-plot-all-if-condition-with-for-loop

编辑： Julien Daltin 2021-4-29

采纳的回答： Alan Stevens

在 MATLAB Online 中打开

Hello :) I have encountered a problem with my code in matlab

I would like to plot a graph with all these condtions but i don't know how to make it

All the calculs here are correct by the way but i don't know how the for loop with the if condition work with the plot function

can someone help me ?

for s=0:0.1:1;
    if s > 0 & s <1  %avoid dividing by 0 
      Z2=sqrt((X.^2)+(R2./s).^2); 
      
        I1=U./(sqrt(X.^2+(R2./s).^2)); 
        Pa=(U.^2./Rf)+(I1.^2).*(R2./s); 
        Q=(U.^2./Xm)+(I1.^2).*X; 
        
        Pr=(I1.^2)*R2./s; 
        Pjr=I1.^2*R2; 
        Pmc=Pr-Pjr; 
        rendement=Pmc/Pa;
        N=Ns.*(1-s); 
   
    else
      
    N =0; 
        rendement=0;
    end
 figure(6)
plot(N,rendement)

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Answer 1

Alan Stevens 2021-4-29

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https://ww2.mathworks.cn/matlabcentral/answers/816810-plot-all-if-condition-with-for-loop#answer_687795

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Do you mean like this:

s = 0:0.1:1;
for i=1:numel(s)
    if s(i) > 0 && s(i) <1  %avoid dividing by 0 
      Z2=sqrt((X.^2)+(R2./s(i)).^2); 
      
        I1=U./(sqrt(X.^2+(R2./s(i)).^2)); 
        Pa=(U.^2./Rf)+(I1.^2).*(R2./s(i)); 
        Q=(U.^2./Xm)+(I1.^2).*X; 
        
        Pr=(I1.^2)*R2./s(i); 
        Pjr=I1.^2*R2; 
        Pmc=Pr-Pjr; 
        rendement(i)=Pmc/Pa;
        N(i)=Ns.*(1-s(i)); 
   
    else
      
    N(i) =0; 
        rendement(i)=0;
    end
end
figure(6)
plot(N,rendement)

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Julien Daltin 2021-4-29

编辑：Julien Daltin 2021-4-29

Yes something like that ! But i saw that ia have a mistake , because when s = 1 → N=1500 and rendement = 0 too , but i will try by myself ! Thank you !!

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Answer 2

Jan 2021-4-29

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/816810-plot-all-if-condition-with-for-loop#answer_687800

编辑：Jan 2021-4-29

在 MATLAB Online 中打开

figure;
axes('NextPlot', 'add');  % as: hold on
for s = 0:0.1:1
    if s > 0 & s < 1  %avoid dividing by 0 
       Z2 = sqrt((X.^2) + (R2 ./ s).^2); 
       I1 = U ./ (sqrt(X.^2 + (R2 ./ s).^2)); 
       Pa = (U .^2 ./ Rf) + (I1.^2) .* (R2 ./ s); 
       Q  = (U .^2 ./ Xm) + (I1.^2) .* X; 
        
       Pr  = (I1.^2) * R2 ./ s; 
       Pjr = I1.^2 * R2; 
       Pmc = Pr - Pjr; 
       rendement=Pmc / Pa;
       N   = Ns .* (1 - s); 
       plot(N, rendement, 'b.')
    end
end