How to animate the plot back and forth for unlimited cycles?

Take the example of code pasted below.

I just want that the ball move back and forth again and again until some body closes the figure. I used 'while true' loop but it is not useful in this regard.

x = linspace(-1, 1, 75);
y = -x.^2;
figure(1)
for k2 = 1:2
    for k1 = 1:length(x)
        plot(x(k1)*(-1)^k2, y(k1), 'ob', 'MarkerFaceColor','r')
        axis([min(x)  max(x)    min(y)  max(y)])
        refreshdata
        drawnow
    end
end

Answer 1

[Subhadeep Koley]

Define a figure CloseRequestFcn like below

function my_closereq(src, callbackdata)
selection = questdlg('Close This Figure?',...
    'Close Request Function',...
    'Yes','No','Yes');
switch selection
    case 'Yes'
        delete(gcf);
    case 'No'
        return
end
end

And use this script

x = linspace(-1, 1, 75);
y = -x.^2;
fig = figure('CloseRequestFcn', @my_closereq);
ax = axes(fig);
while true
for k2 = 1:2
    for k1 = 1:length(x)
        plot(ax, x(k1)*(-1)^k2, y(k1), 'ob', 'MarkerFaceColor','r')
        axis([min(x)  max(x)    min(y)  max(y)])
        refreshdata
        drawnow
    end
end
end

Hope this helps!

[Ahmed Anas]

Yeah, it solved the issue... Thanks bro

[Mike Migliore]

How would I go about altering this. I'd like the dot to switch directions rather than starting over from the initial position. So it would be bouncing back and forth instead.