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Re: fast plotting of streaming data - best approach?

From: Jordi Gutiérrez Hermoso
Subject: Re: fast plotting of streaming data - best approach?
Date: Sat, 25 Jun 2011 08:17:06 -0500

On 25 June 2011 07:00, Alexander Poddey <address@hidden> wrote:
> 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?

I think the communication pipe with gnuplot may be to blame. I just
tried a toy example with fltk, and the speed was quite acceptable. I
think 3.2.4's fltk backend may not be good enough for that. Is it?

- Jordi G. H.

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