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From: Karl Ratzsch <mail.kfr@gmx.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: auto caluclation for data display
Date: Mon, 22 Jun 2015 15:19:04 +0200
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Am 22.06.2015 um 09:06 schrieb Jörg Buchholz:
> On 18.06.2015 21:40, Jörg Buchholz wrote:
>> On 18.06.2015 14:01, Syed Jahanzaib wrote:
> ...
> if (STATS_max_y >= (1024*1024)) {
>      set ylabel "Data Downloaded in GB"
>      plot "data.txt" using 1:($2/1024/1024) with impulse title "Daily 
> Usage" lw 10,\
>      "data.txt" using 1:($2/1024/1024):(sprintf("%.0f",$2/1024/1024)) 
> with labels offset 0,1
>      } else {
>      if (STATS_max_y >= 1024) {
>      set ylabel "Data Downloaded in MB"
>      plot "data.txt" using 1:($2/1024) with impulse title "Daily Usage" 
> lw 10,\
>      "data.txt" using 1:($2/1024):(sprintf("%.0f",$2/1024)) with labels 
> offset 0,1
>      } else {
>      set ylabel "Data Downloaded in KB"
>      plot "data.txt" using 1:2 with impulse title "Daily Usage" lw 10,\
>      "data.txt" using 1:2:(sprintf("%.0f",$2)) with labels offset 0,1
>      }}
> 
> The stats command must be done before you set the xdata to time format.
> 
> Jörg
> 

gnuplot has all the onboard tools to do this in two lines:

set format y "%.b %B"
plot dataf using 1:2: w impulse,\
     dataf using 1:2:(gprintf("%.b %B",$2) w labels

;-)