MATLAB Central Newsreader - Running a function in the background

Running a function in the background

swgillan — Sun, 27 Sep 2009 04:15:13 -0400

I was recently reviewing a webinar on large datasets, and the person
running the webinar ran a function called WriteMalloc (or something
like that).

Essentially what it did was it was a plot window that updated every
second with the amount of memory used by the matlab session.

I am looking at writing something similar, but I have never seen a
figure get updated and run parallel with inputting in the command
window. Does anyone know how this might be done?

This isn't vital, but it was one of those things that I have never
seen before, and think it could be really handy.

Re: Running a function in the background

Steven Lord — Mon, 28 Sep 2009 14:16:43 -0400

"swgillan" <swgillan@gmail.com> wrote in message
news:f48e68c5-54f4-41b8-9843-0d8c995366b0@i4g2000prm.googlegroups.com...
>I was recently reviewing a webinar on large datasets, and the person
> running the webinar ran a function called WriteMalloc (or something
> like that).
>
> Essentially what it did was it was a plot window that updated every
> second with the amount of memory used by the matlab session.
>
> I am looking at writing something similar, but I have never seen a
> figure get updated and run parallel with inputting in the command
> window. Does anyone know how this might be done?
>
> This isn't vital, but it was one of those things that I have never
> seen before, and think it could be really handy.

I don't know specifically what was being used in the webinar you described,
but perhaps that function was using a TIMER object to perform the updates,
or it set the *DataSource properties of a line and used REFRESHDATA to force
it to update?

--
Steve Lord
slord@mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ

Re: Running a function in the background

TideMan — Mon, 28 Sep 2009 19:01:07 -0400

On Sep 27, 5:15 pm, swgillan <swgil...@gmail.com> wrote:
> I was recently reviewing a webinar on large datasets, and the person
> running the webinar ran a function called WriteMalloc (or something
> like that).
>
> Essentially what it did was it was a plot window that updated every
> second with the amount of memory used by the matlab session.
>
> I am looking at writing something similar, but I have never seen a
> figure get updated and run parallel with inputting in the command
> window. Does anyone know how this might be done?
>
> This isn't vital, but it was one of those things that I have never
> seen before, and think it could be really handy.

If you're using Linux, Conky can do this for you.
http://conky.sourceforge.net/

Re: Running a function in the background

swgillan — Wed, 30 Sep 2009 07:09:39 -0400

I wasn't quite sure exactly what they did (the flashed the code, and
that was it).

Essentially, they had a figure window docked and at the same time in
the command window they were doing basic matrix operations showing how
the memory is managed in matlab (hence the updated docked figure
showing the line graph of system.memory, or something like that as
time elapsed).

Basically, that is how they were using it, and I was curious about
looking at the code (it wasn't posted).

I can try and view the topic for anyway else to have a look at it. I
have seen this demo twice before, once in person here at UVIC and
again online.

Steven Gillan

On Sep 28, 7:16 am, "Steven Lord" <sl...@mathworks.com> wrote:
> "swgillan" <swgil...@gmail.com> wrote in message
>
> news:f48e68c5-54f4-41b8-9843-0d8c995366b0@i4g2000prm.googlegroups.com...
>
> >I was recently reviewing a webinar on large datasets, and the person
> > running the webinar ran a function called WriteMalloc (or something
> > like that).
>
> > Essentially what it did was it was a plot window that updated every
> > second with the amount of memory used by the matlab session.
>
> > I am looking at writing something similar, but I have never seen a
> > figure get updated and run parallel with inputting in the command
> > window. Does anyone know how this might be done?
>
> > This isn't vital, but it was one of those things that I have never
> > seen before, and think it could be really handy.
>
> I don't know specifically what was being used in the webinar you described,
> but perhaps that function was using a TIMER object to perform the updates,
> or it set the *DataSource properties of a line and used REFRESHDATA to force
> it to update?
>
> --
> Steve Lord
> sl...@mathworks.com
> comp.soft-sys.matlab (CSSM) FAQ:http://matlabwiki.mathworks.com/MATLAB_FAQ

Re: Running a function in the background

swgillan — Wed, 30 Sep 2009 07:10:27 -0400

On Sep 28, 12:01 pm, TideMan <mul...@gmail.com> wrote:
> On Sep 27, 5:15 pm,swgillan<swgil...@gmail.com> wrote:
>
> > I was recently reviewing a webinar on large datasets, and the person
> > running the webinar ran a function called WriteMalloc (or something
> > like that).
>
> > Essentially what it did was it was a plot window that updated every
> > second with the amount of memory used by the matlab session.
>
> > I am looking at writing something similar, but I have never seen a
> > figure get updated and run parallel with inputting in the command
> > window. Does anyone know how this might be done?
>
> > This isn't vital, but it was one of those things that I have never
> > seen before, and think it could be really handy.
>
> If you're using Linux, Conky can do this for you.http://conky.sourceforge.net/

I am not looking at the specific Malloc and memory case, but more
having the figure updating in the background, while I work in the
command window.

Re: Running a function in the background

swgillan — Wed, 30 Sep 2009 07:39:09 -0400

I found the webinar in question: Large Data Sets in Matlab, presented
by Mike Agostini.

I have since emailed him directly finding out what I wanted. If you
are curious, it was at the 20:00 mark that I was interested in.

Re: Running a function in the background

Steven Lord — Wed, 30 Sep 2009 14:04:09 -0400

"swgillan" <swgillan@gmail.com> wrote in message
news:105ea682-707d-4779-b613-cd1c8bb7cfe0@e4g2000prn.googlegroups.com...
>I found the webinar in question: Large Data Sets in Matlab, presented
> by Mike Agostini.
>
> I have since emailed him directly finding out what I wanted. If you
> are curious, it was at the 20:00 mark that I was interested in.

If I were implementing something like that, I'd use a Timer object to
periodically run a function that updates the figure. As a small example:

function comet2(delayS, x, y)
% COMET2 Display points in a line with a delay between each point display
%
% COMET2(delayS, x, y) displays each of the points represented by elements
% in the x and y vectors with a delay of delayS seconds between each point.

if ~isequal(numel(x), numel(y))
    error('comet2:invalidCoords', 'The x and y inputs must have the same
number of elements.');
end

if ~isreal(delayS) || delayS <= 0 || ~isscalar(delayS) || ~isfinite(delayS)
    error('comet2:invalidDelayS', 'The delay must be a real finite positive
scalar.');
end

h = line(NaN, NaN);
axis([min(x) max(x) min(y) max(y)])
set(h, 'UserData', 1);

t = timer('TasksToExecute', numel(x), ...
    'ExecutionMode', 'fixedRate', ...
    'StartDelay', 0, ...
    'Period', delayS);
set(t, 'TimerFcn', @(varargin) updatePlot(h, x, y, t), ...
    'StopFcn', @(varargin) delete(t));
start(t);

function updatePlot(h, x, y, t)
try
    nextPoint = get(h, 'UserData');
    set(h, 'XData', x(1:nextPoint), 'YData', y(1:nextPoint), 'UserData',
nextPoint+1);
catch %#ok<CTCH>
    stop(t);
end

--
Steve Lord
slord@mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ

Re: Running a function in the background

swgillan — Thu, 01 Oct 2009 02:52:47 -0400

Thanks for sharing that, I have never used a lot of the gcf stuff, so
I will look over that code and take what I can from it. I was also
passed on the watch_malloc code from the presenter, so I should be
able to figure out how things were done!

Thanks for all the help.

Now all I need is to find out why 3d plotting is messed up in Ubuntu
9.04 (I think it is an intel graphics driver problem).

Regards,

Steven Gillan
>
> If I were implementing something like that, I'd use a Timer object to
> periodically run a function that updates the figure. As a small example:
>
> function comet2(delayS, x, y)
> % COMET2 Display points in a line with a delay between each point display
> %
> % COMET2(delayS, x, y) displays each of the points represented by elements
> % in the x and y vectors with a delay of delayS seconds between each point.
>
> if ~isequal(numel(x), numel(y))
> error('comet2:invalidCoords', 'The x and y inputs must have the same
> number of elements.');
> end
>
> if ~isreal(delayS) || delayS <= 0 || ~isscalar(delayS) || ~isfinite(delayS)
> error('comet2:invalidDelayS', 'The delay must be a real finite positive
> scalar.');
> end
>
> h = line(NaN, NaN);
> axis([min(x) max(x) min(y) max(y)])
> set(h, 'UserData', 1);
>
> t = timer('TasksToExecute', numel(x), ...
> 'ExecutionMode', 'fixedRate', ...
> 'StartDelay', 0, ...
> 'Period', delayS);
> set(t, 'TimerFcn', @(varargin) updatePlot(h, x, y, t), ...
> 'StopFcn', @(varargin) delete(t));
> start(t);
>
> function updatePlot(h, x, y, t)
> try
> nextPoint = get(h, 'UserData');
> set(h, 'XData', x(1:nextPoint), 'YData', y(1:nextPoint), 'UserData',
> nextPoint+1);
> catch %#ok<CTCH>
> stop(t);
> end
>
> --
> Steve Lord
> sl...@mathworks.com
> comp.soft-sys.matlab (CSSM) FAQ:http://matlabwiki.mathworks.com/MATLAB_FAQ

Re: Running a function in the background

Simon — Tue, 17 Nov 2009 09:28:01 -0500

swgillan <swgillan@gmail.com> wrote in message <43fc2ee2-059a-4a4f-8455-1adf0388a02d@w37g2000prg.googlegroups.com>...
> Thanks for sharing that, I have never used a lot of the gcf stuff, so
> I will look over that code and take what I can from it. I was also
> passed on the watch_malloc code from the presenter, so I should be
> able to figure out how things were done!
>
> Thanks for all the help.
>
> Now all I need is to find out why 3d plotting is messed up in Ubuntu
> 9.04 (I think it is an intel graphics driver problem).
>
> Regards,
>
> Steven Gillan
> >
> > If I were implementing something like that, I'd use a Timer object to
> > periodically run a function that updates the figure. ?As a small example:
> >
> > function comet2(delayS, x, y)
> > % COMET2 Display points in a line with a delay between each point display
> > %
> > % COMET2(delayS, x, y) displays each of the points represented by elements
> > % in the x and y vectors with a delay of delayS seconds between each point.
> >
> > if ~isequal(numel(x), numel(y))
> > ? ? error('comet2:invalidCoords', 'The x and y inputs must have the same
> > number of elements.');
> > end
> >
> > if ~isreal(delayS) || delayS <= 0 || ~isscalar(delayS) || ~isfinite(delayS)
> > ? ? error('comet2:invalidDelayS', 'The delay must be a real finite positive
> > scalar.');
> > end
> >
> > h = line(NaN, NaN);
> > axis([min(x) max(x) min(y) max(y)])
> > set(h, 'UserData', 1);
> >
> > t = timer('TasksToExecute', numel(x), ...
> > ? ? 'ExecutionMode', 'fixedRate', ...
> > ? ? 'StartDelay', 0, ...
> > ? ? 'Period', delayS);
> > set(t, 'TimerFcn', @(varargin) updatePlot(h, x, y, t), ...
> > ? ? 'StopFcn', @(varargin) delete(t));
> > start(t);
> >
> > function updatePlot(h, x, y, t)
> > try
> > ? ? nextPoint = get(h, 'UserData');
> > ? ? set(h, 'XData', x(1:nextPoint), 'YData', y(1:nextPoint), 'UserData',
> > nextPoint+1);
> > catch %#ok<CTCH>
> > ? ? stop(t);
> > end
> >
> > --
> > Steve Lord
> > sl...@mathworks.com
> > comp.soft-sys.matlab (CSSM) FAQ:http://matlabwiki.mathworks.com/MATLAB_FAQ

Hi

Could you please share what you have found so far? I am also trying to call some function via timer functions and in the background, but my GUI keeps getting locked for the time the m-file is running.

Best regards

Re: Running a function in the background

Peder Schmedling — Wed, 03 Mar 2010 09:00:22 -0500