[Gnuplot-info] trendline

[Natu <inc...@rj...>]

I have a bunch of datafiles that I am plotting as follows:

    set datafile separator ","
    set xdata time
    set xlabel "time/date"
    set grid
    set timefmt "%m/%d/%y,%H:%M:%S"
    set format x "%H:%M\n%m/%d"
    set ylabel "counts"
    set yrange ["42":"91"]
    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";

When I plot certain data files, gnuplot draws a line across the graph
showing the increasing/decreasing trend of the data.  With other data
the line does not get drawn.  I am calling this a trendline because I
don't know what else it would be called (Maybe a fit line?).  I have not
given any commands asking it to do this.

Does anyone know what this is and how it might be turned off?

Thank You,
Natu