Waveform graph data points limit.

[zomboy_]

Hi,

Is there a limit on how many data points a waveform graph can display?

[GerdW]

Hi zomboy,

the technical limit is the available memory…

Practical limit is the width (number of pixels) of your graph! It doesn't make sense to display a milion data points in a graph less than 1000px wide.

[Gregory]

It depends what you want to see. If you want to plot the average of the last 1000 datapoints from a sensor, then 1million data points would fit nicely across 1000 pixels. Mike Porter has a very nice post on plotting large data sets here:

http://www.notatamelion.com/2015/07/31/plotting-large-datasets-without-waiting-forever/

[altenbach]

There are several soft limits. For example if you try to graph 2k plots, each with 4 points, your UI will basically saturate one CPU core while the same number of points graphed as 4 plots with 2k points each will be no problem.