Matlab: replace one plot maintaining others

Question

I have a figure in which I plot some disperse points and then a trajectory. I want to switch between different trajectories by plotting them in the same figure as the points, bu

Answer 1

Perhaps this little demo will be helpful:

xy = rand(20,2);
figure
% Plot first iteration and output handles to each
h = plot(xy(:,1),xy(:,2),'b.',xy(1:2,1),xy(1:2,2),'r-');
axis([0 1 0 1])

% Update second plot by setting the XData and YData properties of the handle
for i = 2:size(xy,1)-1
    set(h(2),{'XData','YData'},{xy(i:i+1,1),xy(i:i+1,2)})
    drawnow
    pause(0.1);
end

You should read up on handle graphics in Matlab and the get and set functions.