How do I plot a figure and animate overlaying plots in a separate figure?

I am trying to understand how to plot a figure and animate on a separate one other stuff. The following piece of code

clear all;
close all;
clc;

% data
x = linspace(0,3,100);
f = sin(x);

% plot 1
figure;
plot(x,x);

% plot 2
figure;
plot(x,3*f);

% plot 3
figure;
for i=1:0.1:5
    scatter(x,f);
    hold on;
    plot(x,i*f);
    hold off;
    drawnow;
end

creates two figures (plot 1 and 2) and then I wanted to animate something on the third figure, where each frame is to be drawn individually based on current plot commands or user-defined plot functions (i.e., I really want to plot first with scatter and on top of it plot the amplified sinus, I dont want to use plot(x,f,x,i*f)). My problem is that the animation sometimes is placed on figure 3 and sometimes on figures 1 or 2. I dont understand why and how I can solve this. Can you help me out? Thank you!

Answer 1

[Mauricio Fernández]

One solution is just to explicitly define the function handle 'fh' and call it before plotting (no need for set(...) or stuff like that)

clear all;
close all;
clc;

% data
x = linspace(0,3,100);
f = sin(x);

% plot 1
figure;
plot(x,x);

% plot 2
figure;
plot(x,3*f);

% plot 3
fh = figure;
for i=1:0.1:5
    figure(fh);
    scatter(x,f);
    hold on;
    plot(x,i*f);
    hold off;
    axis([0,3,0,5]);
    drawnow;
end

For a smoother animation, the axis has been set constant for all plots in the for loop.

Answer 2

[KSSV]

Check Animation code here in the link: https://in.mathworks.com/matlabcentral/fileexchange/33082-simplependulum?focused=5201720&tab=function

[Mauricio Fernández]

Thanks for the link, but there it is not clear what would solve the current problem. By that I mean if defining figure handles or using set() was the thing to do. I gave a separate answer explicitly defining a function handle and calling it, which seems to be easier.

Answer 3

[Hussein]

clc clear all close all figure Z = peaks; surf(Z) axis tight set(gca,'nextplot','replacechildren','visible','off') f = getframe; [im,map] = rgb2ind(f.cdata,256,'nodither'); im(1,1,1,20) = 0; for k = 1:20 surf(cos(2*pi*k/20)*Z,Z) f = getframe; im(:,:,1,k) = rgb2ind(f.cdata,map,'nodither'); end imwrite(im,map,'DancingPeaks.gif','DelayTime',0.1,'LoopCount',inf) %g443800