gnuplot-info

[Gnuplot-info] Incrementally updating a plot

[Donald R. S. Jr. <dsc...@ya...>]

Is there a way to add data points to an existing plot
by only plotting the new points?  This would be
extremely useful for real-time plotting of data
collection experiments.  Replotting the entire data
file becomes unwieldy and slow when the data set
grows...  The IDL (Interactive Data Language) package
by Research Systems Inc. has the "oplot" command to
overplot on an existing plot.

If this is not currently possible I'd sure like to
urge it's addition to future versions!

Gnuplot is truly a great package- thank you
developers/contributors.


Sincerely,

Donald R. Schropp, Jr.

dsc...@ya...



		
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Re: [Gnuplot-info] Incrementally updating a plot

[Hans-Bernhard B. <br...@ph...>]

Donald R. Schropp, Jr. wrote:
> Is there a way to add data points to an existing plot
> by only plotting the new points?  

Not really.  gnuplot is designed to be a real-time plotting engine.

You could, in principle, achieve this in multiplot mode, with all
dynamic properties fixed in advance.

> collection experiments.  Replotting the entire data
> file becomes unwieldy and slow when the data set
> grows...  

So the data set (as seen by gnuplot) shouldn't be allowed to keep on 
growing. You can scrap old data every now and then, instead, or re-send 
exactly those data you do want to display with each refresh.