Plot unique x-y points

[sanderson]

Hi all,

I am somewhat new to Node-Red and Dashboard-2. I have an ongoing stream of integer x-y points from 0-100 going into a graph over time. I would like to plot them only if the x-y point is unique. Any ideas on how to achieve this? I seek to minimize the redundant points to keep the plotting fast over months of data acquisition.

Thanks!

[Colin]

I think you would have to use javascript in a function node to do this, using a 2 dimensional array 100x100 to hold an indication of which points that had already been plotted.

[E1cid]

Should be possible saving plotted position in a context var, then using a switch node to only allow non plotted data through.
e.g.

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No coding required.

[Colin]

Much better than my suggestion.

[sanderson]

This is brilliant. Thank you so much! I didn't realize one could use the flow variable like this, so it makes for a nice education, too. Cheers!