Holding legend on a Matlab plot inside a loop

Question

Amal Elawad 2017-1-7

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/319442-holding-legend-on-a-matlab-plot-inside-a-loop

评论： Amal Elawad 2017-1-9

Hello, I have multiple plots to do using "hold all" and a for loop. However, I want to also add a legend every time I generate a new plot while keeping the old legends. How can I do that? Part of my code is as follows:

------------------------------
figure 
subplot(2,2,1) 
  plot(t,H(1,:)), xlabel('t [s]'), ylabel('H [m]')
  for i =2:n
        % holds old plot for multi-line plots
        hold all
        plot(t,H(i,:)), xlabel('t [s]'), ylabel('H [m]')
    end

Thanks in advance :)

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Answer 1

Image Analyst 2017-1-7

3
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/319442-holding-legend-on-a-matlab-plot-inside-a-loop#answer_249723

在 MATLAB Online 中打开

Make a cell array and then call legend with it on every iteration.

H = rand(5, 20);
[rows, columns] = size(H);
t = 1 : columns;
subplot(2,2,1)
plot(t,H(1,:)) 
grid on;
xlabel('t [s]')
ylabel('H [m]')
legendText = {'Plot #1'};
for k = 2 : rows
  % holds old plot for multi-line plots
  hold all
  plot(t,H(k,:));
  legendText{k} = sprintf('Plot #%d', k);
  legend(legendText);
  drawnow; % Force screen refresh.
end