MATLAB: How to animate the plot

animateplot

x=randn(2,10000); a=x(1,:); b=x(2,:); figure;plot(a,b,'.')

Best Answer

x=randn(2,10000); 
a=x(1,:); 
b=x(2,:); 
% figure;
% plot(a,b,'.')
figure(1)
axis([min(a) max(a) min(b) max(b)])
hold on
filename = 'test.gif';
for n = 1:length(a)
        plot(a(n),b(n),'.')
        drawnow
        frame = getframe(1);
        im = frame2im(frame);
        [imind,cm] = rgb2ind(im,256);
        if n == 1;
            imwrite(imind,cm,filename,'gif', 'Loopcount',inf);
        else
            imwrite(imind,cm,filename,'gif','WriteMode','append');
        end
  end

Related Solutions

MATLAB: All figures in subplot saved to animated gif file.

I think I have solved this myself. I will leave the answer here in case anyone else has a similar problem.

Ammended code:

fig_num = 1; % sets number of figure to be opened
for ii = 1:5
      figure(fig_num)
      subplot(1,2,1);
      imagesc(rand(10))
      title(num2str(ii))
      daspect([1 1 1])
      subplot(1,2,2)
      imagesc(rand(10))
      title(num2str(ii))
      daspect([1 1 1])
      filename = 'saved_gif.gif';
      del = 0.1; % time between animation frames
      drawnow 
      frame = getframe(fig_num);
      im = frame2im(frame);
      [imind,cm] = rgb2ind(im,256);
      if ii == 1;
        imwrite(imind,cm,filename,'gif','Loopcount',inf,'DelayTime',del);
      else
        imwrite(imind,cm,filename,'gif','WriteMode','append','DelayTime',del);
      end
end

Essentially, you need only to declare a figure number and call that number with getframe later in the script.

I hope this is helpful.

MATLAB: GIF speed not as expected! Help!

Edited and the delay time has been set to 0.1 seconds:

%draw rectangle and lambda
  clear;
  figure();
  rectangle('Position',[0 2 10 1]);
  axis off
  set(gcf,'Position',[ -901   789   579    70])
  t=0:0.05:3
  l=1; a=0.5 
  p=@(t,l,a) 1-(1-a).*exp(-l.*t); 
  x=[0 0 10 10];
  y=[2 3 3 2]; 
  patch(x,y,'white');
  frame=getframe(gca); im=frame2im(frame); 
  [imind,cm] = rgb2ind(im,256); 
  filename='bar.gif';
  imwrite(imind,cm,filename,'gif','DelayTime',0.1, 'Loopcount',inf);
  for tt=1:length(t)
      pt=p(t(tt),l,a);
      x=[0 0 10.*pt 10.*pt];
      patch(x,y,'green');
     % pause(.01); drawnow;
         frame(tt)=getframe(gca);
    end 
    for tt=1:length(t)
     im=frame2im(frame(tt)); 
         [imind,cm] = rgb2ind(im,256);
         imwrite(imind,cm,filename, 'gif','DelayTime',0.1,'WriteMode','append');
    end

Best Answer

Related Solutions

MATLAB: All figures in subplot saved to animated gif file.

MATLAB: GIF speed not as expected! Help!

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