[Gnuplot-info] Help with continually piping to gnuplot

[Tony7682 <ton...@ya...>]

Hi,

I am a new here. Please be gentle :)

What I am doing is the following: cat'ing out the contents of an mgen log
file, piping that to trpr (which processes the mgen results into
gnuplot-readable format), and then piping that output to gnuplot.

mgen info: http://pf.itd.nrl.navy.mil/mgen/mgen.html
trpr info: http://pf.itd.nrl.navy.mil/protools/trpr.html

The environment I am working in is the following:
Windows XP SP2
Cygwin Bash and xterm
Cygwin Gnuplot
mgen and trpr compiled for Windows

Here is the bash script I am running:

for i in $(seq 1 180)
do
    sleep 10
    if [ `expr $i % 6` -ne 0 ]; then
        # show snapshot
        cat $MGLOGFILE | trpr drec real auto X | gnuplot -noraise -persist
        if [ -f $PLOTFILE ]; then
            rm -vf $PLOTFILE
        fi
    else
        # show cumulative results
        cat $MGLOGFILE | trpr drec auto X output $PLOTFILE && gnuplot
-noraise -persist $PLOTFILE
    fi
done

(I've tried piping tail -f output instead of cat output to trpr, but that
would not work for some reason.)

The above seems to be working ok except for one thing: Each call to the cat
| trpr | gnuplot line (bolded above) causes a new, separate gnuplot window
to open. What I would like is for each successive call to that line to
direct its output to the same gnuplot. That way, I don't have a new gnuplot
window popping up every 10 seconds.

My workaround right now is to have a wrapper script that periodically closes
any gnuplot windows. I'd rather avoid having to do that, though.

Anyone know how to keep continually writing (and rewriting) to one gnuplot
window?
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