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From: =?ISO-8859-1?Q?Hans-Bernhard_Br=F6ker?= <HBBroeker@t-online.de>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Data manipulation (gnuplot)
Date: Sat, 07 Sep 2013 20:13:37 +0200
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On 07.09.2013 18:00, Dan Merschi wrote:

> As you can see the master pull the devices every 2 minutes at 2 seconds interval.
> Right now I use awk collect only the records for the last 24 hours , split the log file into sensor file and plot the graph for each sensor as:
>
> plot  "284743A60300000D.log" using 2:3 title "Out" with lines   lt 1 lw 1 lc rgb 'black'\
>       ,"28D942A603000062.log" using 2:3 title "In" with lines   lt 1 lw 1 lc rgb 'blue'\
>       ,"28F357A6030000B5.log" using 2:3 title "Tank" with lines lt 1 lw 1 lc rgb 'red'
>
>
> The question is can I plot directly from gnuplot wit%Shout using external applications.

That's going to prove trick, particularly the "reducse to the last 24 
hours worth of data" job.  Once you've solved that, you can probably do 
something like

	set ydata time
	set timefmt y "%s"

	splot "temp_last_24h.log" u 1:2:3:xticlabels(1) with lines

for a quick overview. Individual sensors' data should be available via

   plot "temp_last_24h.log" u (stringcolumn(1) eq '28D942A603000062' ? 
$2 : NaN):3 w l