How do I do multi animated lines in one axes?

Question

ren ren 2016-8-30

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https://ww2.mathworks.cn/matlabcentral/answers/301358-how-do-i-do-multi-animated-lines-in-one-axes

评论： Koen 2020-11-17

I need to do two multi animated lines in one axes.Is there any solution to this problem? As picture shows： This picture use "plot" ,but It's slowly when close to the end. And the matlab give a suggestion :use animatline to instead the plot function.

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Answer 1

Thorsten 2016-8-30

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编辑：Thorsten 2016-8-30

在 MATLAB Online 中打开

Just create a second animatedline and use addpoints:

    numpoints = 100000; 
    x = linspace(0,4*pi,numpoints); 
    y = sin(x); 
    y2 = cos(x);
    figure 
    h = animatedline; 
    h2 = animatedline;
    axis([0,4*pi,-1,1]) 
    for k = 1:numpoints 
      addpoints(h,x(k),y(k)) 
      addpoints(h2,x(k),y2(k)) 
      drawnow update 
    end

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Walter Roberson 2020-8-16

saveas() or print()

Or getframe() and imwrite() the data part of it.

Koen 2020-11-17

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I want to add animatedlines programmatically rather than using h1, h2, h3... (number of lines depends on certain input arguments in code)

h(1:num_lines) = animatedline

creates an animatedline array. I'm trying to access these in a loop where data is updated by doing something like

for x = 1:10
    for i = 1:num_lines
        y = i*x;
        addpoints(h(i),x,y)
    end
end

Intuitively, I would expect this code to create straight lines with different slopes. However this does not seem to work this way: it creates a single line (instead of num_lines), concatenating values h(1:num_lines). Is it possible to use animatedline in a similar way; using indices to feed data?

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Answer 2

Le Dung 2017-12-15

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编辑：Le Dung 2017-12-15

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I suggest to you another approach, i think it is familiar to anyone. You can use "hold on" after "figure" And, of course, at the moment, "update" in "drawnow is no need. I will use example that Thorsten is given. Of course, to reduce cost time, i use 1000 to replace for 100000.

numpoints = 1000; 
    x = linspace(0,4*pi,numpoints); 
    y = sin(x); 
    y2 = cos(x);
    figure 
    hold on % To hold this figure.
    h = animatedline; 
    h2 = animatedline;
    axis([0,4*pi,-1,1]) 
    for k = 1:numpoints 
      addpoints(h,x(k),y(k)) 
      addpoints(h2,x(k),y2(k)) 
      drawnow % "update" is no need for this case
    end