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Re: fast plotting of streaming data - best approach?

From: Martijn
Subject: Re: fast plotting of streaming data - best approach?
Date: Mon, 27 Jun 2011 12:36:35 +0200

Hi Alexader,
In addition to using the fltk backend you can also just replace the
ydata of you plot, instead of replotting the entire graph:

l = plot(t,x1);
set(l, "ydata", x2)

This avoids drawing of axis, labels and so on.


On Sat, 2011-06-25 at 14:00 +0200, Alexander Poddey wrote:
> Hi all,
> I have some data which comes streaming in (at e.g. 1000 samples /s).
> I hold the old data (at least a part of it) and want to plot lets say the 
> last 
> 5000 data points, updated every 1/10 s.
> Calling plot takes a few seconds to bring up the plot (debian squeeze, octave 
> 3.2.4, gnuplot 4.4) - the naive approach to re-call plot with the new data is 
> too slow.
> Which would be the best strategy to do this?
> Thanks
> Alex   
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