Re: fast plotting of streaming data - best approach?

[Michael Goffioul]

To be correct, it will redraw everything, but it won't recreate everything.
This will also save you all the processing of the "plot" function, as well
as the associated function call overheads.

Michael.


On Mon, Jun 27, 2011 at 11:36 AM, Martijn <address@hidden> wrote:
> 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.
>
> Martijn
>
>
> 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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>
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