"errors" when running plot

[ws]

> I assume you're just wanting to suppress output to a window? If not, can you 
describe what behavior it is you desire?
> 
> If you'd like to suppress displayed output, you can begin our Octave session 
with
> 
>     set (0, "defaultfigurevisible", "off")
> 
> That will suppress output to a window, but the print command will still work.

Thanks Ben -- I am almost there.  I made the following changes to 
octavehome/share/octave/site/m/startup/octaverc, and plotting works great:

putenv('DISPLAY', '')
putenv('GNUTERM', 'png')
gnuplot_binary ('/home/wsprague/gnuplot-4.2.5/bin/gnuplot')
set (0, "defaultfigurevisible", "off")

However, I am still getting "warning: X11 DISPLAY environment variable not set" 
errors when I start up.  Since I am running completely "X-less" (graphing 
highway vehicle traffic using a cron job), I would like to make this go away -- 
if nothing else, for the sake of good craftsmanship.

Thanks to Ben and all Octave users and developers!