How to plot curves with different colors with "if" conditions

Question

EldaEbrithil 2021-5-18

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/832933-how-to-plot-curves-with-different-colors-with-if-conditions

评论： EldaEbrithil 2021-5-18

Hi all

i want to realize a multilines plot using if conditions. The target is to plot each row of r_T for different columns(or "Weight" values). i_ed can ony varies between 1 and 5 so i decide to differentiate the colors of the curves. i_ed,j_ed,k_ed,w_ed,v_ed have the same dimension. How can i do that?

Thank you for the help!!

for i=1:length(i_ed)   
     for w=1:length(Delta_cb)
r_T(i,w)=0.5*rho*(Larg_cb(j_ed(i))*T_end(k_ed(i))+2*(L_cb(i_ed(i))*(Larg_cb(j_ed(i))/(2*cosd(((atan(2*T_end(k_ed(i))/Larg_cb(j_ed(i))))*180/pi)))))*2)*...
    ((1+(-0.095+25.6*(((Weight(w)/(rho))/(L_cb(i_ed(i))*Larg_cb(j_ed(i))*T_end(k_ed(i))))/...
    (((L_cb(i_ed(i))/Larg_cb(j_ed(i)))^2)*sqrt(Larg_cb(j_ed(i))/T_end(k_ed(i)))))))*(0.075/...
    ((log(((rho*V(v_ed(i))*L_cb(i_ed(i)))/(mu_din)))-2)^2))+(1.85e+04*((V(v_ed(i))/(sqrt(9.81*L_cb(i_ed(i)))))^6) -...
    1.92e+04*((V(v_ed(i))/(sqrt(9.81*L_cb(i_ed(i))))))^5 + ...
    7.38e+03*((V(v_ed(i))/(sqrt(9.81*L_cb(i_ed(i))))))^4 - 1.30e+03*...
    ((V(v_ed(i))/(sqrt(9.81*L_cb(i_ed(i))))))^3 + 1.06e+02*((V(v_ed(i))/...
    (sqrt(9.81*L_cb(i_ed(i))))))^2 - 2.65e+00*(V(v_ed(i))/(sqrt(9.81*L_cb(i_ed(i)))))...
    + 7.96e-02))*V(v_ed(i))^2;%N
end   
end
for i=1:length(i_ed)   
if i_ed(i)==1
c = 'r';
if i_ed(i)==2
c = 'b';
if i_ed(i)==3  
c = 'y';    
if i_ed(i)==4   
c = 'g';    
if i_ed(i)==5   
c = 'k';    
figure(1);
set(figure(1),'Visible','on');
plot(Weight(:),r_T(i,:), c,'LineWidth',1);
xlabel('Weight_K_g')
ylabel('RT_N')
hold on
end
end
end
end
end
end

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Answer 1

Rik 2021-5-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/832933-how-to-plot-curves-with-different-colors-with-if-conditions#answer_702368

在 MATLAB Online 中打开

You have nested your if statements, which would have been very easy to spot if you had used the debugger to step through the code.

You can replace the plotting loop with this:

f=figure(1);
set(f,'Visible','on');
c_array={'r','b','y','g','k'};
for i=1:numel(i_ed)   
    c=c_array{i_ed(i)};    
    plot(Weight(:),r_T(i,:), c,'LineWidth',1);
    hold on
end
xlabel('Weight_K_g')
ylabel('RT_N')
hold off