George Langford via plug on 31 Jan 2022 03:24:09 -0800


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[PLUG] Grace - help needed to annotate individual data points

Actually, it's help with the xmgrace WYSIWYG linux program that's needed. The task is to plot data from spammy emails, with the X-Axis epochal time in seconds from Jan. 1, 1970 and the Y-Axis the X-Spam-Score. The plot would be far easier to understand if I could provide a secondary Y-Axis with calendar dates. However, this isn't just an alternate set of units, because the months have differing numbers of days. Therefore, I've looked up the epochal time for each first day of each month of the years, and that's what are plotted across the top of each of the attached plots. The date data use the pipe ("|") symbol (ASCII 127 in xmgrace) repeated enough times to merge into the vertical bars best viewed in the native Grace-Data4.agr plot along the top of the graph.
The only website that describes the process for annotating individual points 
in a Grace plot tries to emulate YouTube but the steps are presented too
quickly for any hope of following to exits. Here's that link:
https://www.originlab.com/doc/Quick-Help/Label-Ploints-with-XY
I've edited the postscript version of the first plot with GIMP to show what I'm trying to accomplish, but that's tedious and bloats the file too much. 

I would have used PSI-Plot (and wine) to do this, but Trisquel no longer
supports wine, so I've started learning Grace. Does anyone on PLUG actually 
use Grace with enough experience to give me some hints ?

George Langford
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