Re: [Gnuplot-info] trendline

[Hans-Bernhard B. <HBB...@t-...>]

On 10.03.2014 01:03, Natu wrote:

>      set multiplot
>      plot "GKLOG001_25452.AVG" using 1:7 with linespoints title "\n5
> minute min/avg/max" lt rgb "blue";
>      plot "GKLOG001_25452.MIN" using 1:7 with linespoints title "" lt rgb
> "green";
>      plot "GKLOG001_25452.MAX" using 1:7 with linespoints title "" lt rgb
> "red";

This use of 'multiplot' is ill-advised.  It will not have any positive 
effect compared to a more straight-forward

       plot "GKLOG001_25452.AVG" u 1:7 w lp t "avg" lt rgb "blue", \
          "GKLOG001_25452.MIN" u 1:7 w lp t"min" lt rgb "green", \
         "GKLOG001_25452.MAX" u 1:7 wlp t "max" lt rgb "red"

> When I plot certain data files, gnuplot draws a line across the graph
> showing the increasing/decreasing trend of the data.

I'm reasonably sure this has nothing to do with any trend.  But it's 
hard to know what else it might be, because you don't show any data that 
triggered it.