Plot multiple lines in the same plot

Question

Naiara Romero Anton 2020-5-13

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https://ww2.mathworks.cn/matlabcentral/answers/525264-plot-multiple-lines-in-the-same-plot

编辑： Naiara Romero Anton 2020-5-14

Dear all,

I am plotting in the same graph various lines and I am using hold on command. However, between the plotted lines additional lines appear linking these lines. See attached files to understand better.

How can be deleted this linking lines?

This is the code developed:

clear 
clc 
close all 
Nmixf = 51; 
mixfgrid = linspace(0,1,51); 
Zst = 0.071077;
index_sDVi=2;
index_sDHi=6;
Mwrite = mixfgrid'; 
Mwrite(:,2) = Mwrite(:,1) + sDV(index_sDVi)*(1-Mwrite(:,1))*Zst;
temp=readmatrix('Temperature_Table_4D');
rows = any(isnan(temp),2); %delete NaN values
temp(rows,:) = [];
indices = find(abs(temp)<100); 
temp(indices) = [];
N3=51;
N4=51;
N5=13;
N6=11;
for q=1:N3
    for k=1:N4
        n=(q-1)+N3*((k-1)+N4*((index_sDHi-1)+N5*(index_sDVi-1)))+1;
        T(k)=temp(n);
        Z(k)=Mwrite(k,2);
        plot(Z, T,'r');
        set(gca,'xlim',[0 1],'ylim',[350,2500]); 
        set(gca,'FontSize',12);
        set(gca,'LineWidth',1.0);
        set(gca,'PlotBoxAspectRatio',[1 1 1]);
        xlabel('Mixture fraction','FontSize',12);
        ylabel('Temperature [K]','FontSize',12);
        hold on
    end
  end

Thank you in advance,

Kind regards,

Naiara

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Geoff Hayes 2020-5-14

在 MATLAB Online 中打开

Naiara - you may need to provide some of your data so that we can reproduce the above. That being said, in these lines of code

T(k)=temp(n);
Z(k)=Mwrite(k,2);
plot(Z, T,'r');

you are updating the arrays T and Z on each iteration and then plotting all of the data in that array even that data which was drawn on previous iterations. Is that what you want to do? Or do you just want to plot the new data?

Naiara Romero Anton 2020-5-14

编辑：Naiara Romero Anton 2020-5-14

Dear Geoff,

Thank you for your answer. In the lines of the code that you mention I just want to plot the new data, but if I write the next lines, nothing is drawn in the graph. In the next link you can download Temperature_Table_4D file: https://we.tl/t-q8778uZdWJ

T(k)=temp(n);

Z(k)=Mwrite(k,2);

plot(Z(k), T(k),'r');

Additionally, the following code is missing (this goes after close all):

sDV = [0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1]; %se definen los valores de dilución

sDH = [0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.85 0.9 0.95 1]; %se definen los valores de enthalpy loss

PV=linspace(0,1,51);

Thank you in advance,

Kind regards,

Naiara

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Plot multiple lines in the same plot

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