Plot lines with different colors each iteration

Question

Geriffa 2018-5-12

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编辑： Image Analyst 2018-5-12

Hi,

The following code plots 5 lines, all in black. I want them different in colors for each iteration. This section is within a large loop.

      Q = volymflode*3600;
      H = DeltaPF_TOT/(((rho_varm+rho_kall)/2)*g);
      vektor_Q(1,j)=Q;
      vektor_H(1,j)=H;
          figure(1);
          title('Systemkurva');
          plot(vektor_Q,vektor_H,'k-','LineWidth',1);
          ylabel('Uppfodringshöjd [m]');
          xlabel('Volymflöde [M^3/h]');
          plot(Qpump1,Hpump1,'b-')
          j=j+1;
          hold on

How do i make this happen?

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Answer 1

Mohammad Alhashash 2018-5-12

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I've I assumed the loop index to be ii, then you can modify the plot portion of your code to be:

 colorInd='ckyrb';
 plot(vektor_Q,vektor_H,['-' colorInd(ii)],'LineWidth',1);

In this case, the color will be in the following order: 1.cyan 2.black 3.yallow 4.red 5.blue You can use whatever color you want by typing different symbols in colorInd variable.This may help also : https://www.mathworks.com/help/matlab/ref/linespec.html

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Geriffa 2018-5-12

编辑：Geriffa 2018-5-12

Should've mentioned it's within a while loop so no direct loop index exists, so I don't think this will work in my case. Got any another ideas more easily implemented in a while loop?

Edit: The while loop uses a counter and the loop stops when the counter reaches 50.

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Answer 2

Image Analyst 2018-5-12

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https://ww2.mathworks.cn/matlabcentral/answers/400442-plot-lines-with-different-colors-each-iteration#answer_319951

编辑：Image Analyst 2018-5-12

在 MATLAB Online 中打开

Simply get rid of the k

plot(vektor_Q, vektor_H, '-', 'LineWidth', 1);
ylabel('Uppfodringshöjd [m]');
xlabel('Volymflöde [M^3/h]');
hold on;
plot(Qpump1, Hpump1, 'b-', 'LineWidth', 2)

That will use the defined color order for plots, one of which is probably blue, so that's why I set the linewidth of your blue plot to 2 so you can tell the difference. If you want to specify the colororder, see attached demos.