MATLAB: How to plot a figure and animate overlaying plots in a separate figure

animationplot

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!

Best Answer

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.
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