How can i draw two animated plots on each subplots at the same time?

Hi everyone! Now, i want to draw two animated plots on each subplots at the same time. You can see my code below. But, when i use this code, of course, Matlab will return two subplots and it will draw "k" line after drew "r" line. So, how can i do to draw two animated plots (in this case is two lines) at the same time? Thank you so much. My code:

x1=linspace(0,20,201);
y1=sin(x1);
x2=linspace(0,20,201);
y2=cos(x2);
sub1=subplot(2,1,1);
hold on
axis([0 21 -1.1 1.1]); 
ani1=animatedline('Color','r');
for i=1:length(x1)
    addpoints(ani1,x1(i),y1(i));
    drawnow
    pause(0.01);
end
subplot(2,1,2)
hold on
axis([0 21 -1.1 1.1]); 
ani2=animatedline('Color','k');
for j=1:length(x1)
    addpoints(ani2,x1(j),y1(j))
    drawnow
    pause(0.01);
end

Answer 1

[Jos (10584)]

Merge the for-loops! This works here because x1,y1, x2, and y2 are all the same length. There is also no need for hold on)

x1=linspace(0,20,201);
y1=sin(x1);
x2=linspace(0,20,201);
y2=cos(x2);
sub1=subplot(2,1,1);
axis([0 21 -1.1 1.1]); 
ani1=animatedline('Color','r');
subplot(2,1,2)
axis([0 21 -1.1 1.1]); 
ani2=animatedline('Color','k');
for k=1:length(x1)
    addpoints(ani1,x1(k),y1(k)) ;
    addpoints(ani2,x2(k),y2(k)) ;% I assume you meant to plot (x2,y2)
    drawnow
    pause(0.01);
end

[Le Dung]

Yes. thank you so much. Jos (10584). Of course, hold on is not need for this case. But, if x1,y1, x2, and y2 are NOT all the same length, how can we solve?

[Jos (10584)]

I assume there is a relationship between x1 and x2? For instance, both are time points. You can use interp1 to get, for instance, y2 values for each point in x1, like this:

x1 = linspace(0,20,200)
y1 = sin(x1) ;
x2 = linspace(0,20,100)
y2 = cos(x2) ;
y2_int = interp1(x2,y2,x1) ;

and now use x1 as the x coordinate for both animations.

[Le Dung]

It is very kind of you. Thank you so much. And, you can help me to my question on this link: https://www.mathworks.com/matlabcentral/answers/373112-how-can-i-specify-which-subplot-that-i-want-to-plot-on-it

Answer 2

[Riccardo Rosati]

If I create the number of subplot iteratively (because this is for a GUI where I manually insert the number of signals that I want to plot), how can I do this? I should generate iteratively also the animated lines, but how?

Thanks in advance for the reply.