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From: Adam on 7 Jun 2010 19:07
Hi,

I would like, in a loop, to plot a dynamic line. What I'm looking for it the line start at zero, then a random point is generated and the line goes to that point (1,randompoint1) then a pause, then it extends to (2,randompoint2) etc.. This should continue until the loops stops. It should be an easy task but I can't find a way to do it.

Here is an example of what I mean for the end result except that months would just be 1,2,3..n. http://edynblog.files.wordpress.com/2007/07/line-graph-days-on-market.jpg
From: Walter Roberson on 7 Jun 2010 19:32
Adam wrote:

> I would like, in a loop, to plot a dynamic line. What I'm looking for it
> the line start at zero, then a random point is generated and the line
> goes to that point (1,randompoint1) then a pause, then it extends to
> (2,randompoint2) etc.. This should continue until the loops stops. It
> should be an easy task but I can't find a way to do it.

for pointnum = 1:1000
thisx = .... %random new position
thisy = .... %random new position

if pointnum == 1
linehandle = plot([0 thisx],[0 thisy]);
else
pause(1/2); %seconds
oldx = get(linehandle, 'XData');
oldy = get(linehandle, 'YData');
set(linehandle, 'XData', [oldx thisx], 'YData', [oldy thisy]);
end
end
From: Adam on 7 Jun 2010 19:40
Walter Roberson <roberson(a)hushmail.com> wrote in message <hujvl8$gvb$1(a)canopus.cc.umanitoba.ca>...
> Adam wrote:
>
> > I would like, in a loop, to plot a dynamic line. What I'm looking for it
> > the line start at zero, then a random point is generated and the line
> > goes to that point (1,randompoint1) then a pause, then it extends to
> > (2,randompoint2) etc.. This should continue until the loops stops. It
> > should be an easy task but I can't find a way to do it.
>
> for pointnum = 1:1000
> thisx = .... %random new position
> thisy = .... %random new position
>
> if pointnum == 1
> linehandle = plot([0 thisx],[0 thisy]);
> else
> pause(1/2); %seconds
> oldx = get(linehandle, 'XData');
> oldy = get(linehandle, 'YData');
> set(linehandle, 'XData', [oldx thisx], 'YData', [oldy thisy]);
> end
> end

Thats perfect thanks. My actual implementation is going be a bit more complex but this should be enough for me to get it done. Thanks again.
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