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From: workaholic on 17 Jan 2010 01:03
I want to show a batch of data in an animation in plot,combining with
'drawnow' and 'refreshdata' command. But I found that the axis is
constantly changing accordingly. How can I fix the axis?
From: Jan Simon on 17 Jan 2010 06:53
Dear workaholic!

> I want to show a batch of data in an animation in plot,combining with
> 'drawnow' and 'refreshdata' command. But I found that the axis is
> constantly changing accordingly. How can I fix the axis?

I cannot understand the question. What part/kind/entity of the axis is changing accordingly to what?
Do you look for the AXES objects property 'NextPlot' and set it to 'add'?

I suggest, you post the small part of your program, which reproduces the problem.

Kind regards, Jan
From: Bruno Luong on 17 Jan 2010 07:16
workaholic <liuauto(a)gmail.com> wrote in message <288f2be6-c093-482a-a36a-9708edcff329(a)a6g2000yqm.googlegroups.com>...
> I want to show a batch of data in an animation in plot,combining with
> 'drawnow' and 'refreshdata' command. But I found that the axis is
> constantly changing accordingly. How can I fix the axis?

Use AXIS command to force the axis at given fixed limits.

Bruno
From: workaholic on 18 Jan 2010 08:10
On 17 Jan., 11:53, "Jan Simon" <matlab.THIS_Y...(a)nMINUSsimon.de>
wrote:
> Dear workaholic!
>
> > I want to show a batch of data in an animation in plot,combining with
> > 'drawnow' and 'refreshdata' command. But I found that the axis is
> > constantly changing accordingly. How can I fix the axis?
>
> I cannot understand the question. What part/kind/entity of the axis is changing accordingly to what?
> Do you look for the AXES objects property 'NextPlot' and set it to 'add'?
>
> I suggest, you post the small part of your program, which reproduces the problem.
>
> Kind regards, Ja


My code is below:

h = plot(xpos,ypos,'XDataSource','xpos','YDataSource','ypos');

for k = 1:tlen

% pos is a data pool

xpos = pos(k,:);
ypos = pos(k+1,:);

refreshdata(h,'caller') % Evaluate y in the function workspace
drawnow; pause(.1)
end

I tried to put some code before the plot command like axis([xmin xmax
ymin ymax]) but it does not work at all, the coordinate of the plot is
changing at every iteration. How can I deal with it?
Thanks
From: Jos (10584) on 18 Jan 2010 08:49
workaholic <liuauto(a)gmail.com> wrote in message <bbb5b046-b3ca-4044-940a-42ff66c0a145(a)f12g2000yqn.googlegroups.com>...
> On 17 Jan., 11:53, "Jan Simon" <matlab.THIS_Y...(a)nMINUSsimon.de>
> wrote:
> > Dear workaholic!
> >
> > > I want to show a batch of data in an animation in plot,combining with
> > > 'drawnow' and 'refreshdata' command. But I found that the axis is
> > > constantly changing accordingly. How can I fix the axis?
> >
> > I cannot understand the question. What part/kind/entity of the axis is changing accordingly to what?
> > Do you look for the AXES objects property 'NextPlot' and set it to 'add'?
> >
> > I suggest, you post the small part of your program, which reproduces the problem.
> >
> > Kind regards, Ja
>
>
> My code is below:
>
> h = plot(xpos,ypos,'XDataSource','xpos','YDataSource','ypos');
>
> for k = 1:tlen
>
> % pos is a data pool
>
> xpos = pos(k,:);
> ypos = pos(k+1,:);
>
> refreshdata(h,'caller') % Evaluate y in the function workspace
> drawnow; pause(.1)
> end
>
> I tried to put some code before the plot command like axis([xmin xmax
> ymin ymax]) but it does not work at all, the coordinate of the plot is
> changing at every iteration. How can I deal with it?
> Thanks

Here is an alternative, using SET instead of refreshdata, so not all sources are refreshed on each loop:

% data (Lissajous curves)
t = linspace(0,2*pi,50) ;
x = 2 * sin(3*t) ;
y = 3 * sin(4*t) ;

figure % force view
h = plot(x(1),y(1),'b-',x(1),y(1),'ro') ;
pause(0.5) ;
axis([-3 3 -4 14]) ; % specify a strange axis, that is not changed

for ii=2:numel(x),
% update plots
set(h(1),'xdata',x(1:ii),'ydata',y(1:ii)) ;
set(h(2),'xdata',x(ii),'ydata',y(ii)) ;
pause(0.1) ; drawnow ; % visibility
end


hth
Jos
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