animation: point following line in 2d plot

Hi, I think i have a fairly easy question but i just can't get it to work. I am trying to create a plot of a 2d line, and i want a point to slowly follow that line. My code so far is:

figure
plot(y)
t=(length(y)+1);
i=1;
while i<t
    hold on
    plot(i,y(i),'o m');
    hold off
    i=i+1;
    pause(0.1);
end

The problem is that all the points are drawn, but how can i delete the previous point (y(i-1))? Thanks!

Answer 1

[bym]

here is one way:

x = 0:pi/50:2*pi;

y = sin(4*x);
plot(x,y)
hold on
h = plot(x(1),y(1),'mo','MarkerFaceColor','m',...
                   'YDataSource','Y',...
                   'XDataSource','X');

for t = 1:numel(x)
    X = x(t);
    Y = y(t);
    refreshdata(h,'caller');
    drawnow;
    pause(.1);
end