Using the HP 7550A Plotter with Gnuplot
University of Hawaii at Manoa
College of Engineering
Gnuplot supports the Hewlett-Packard Graphics Language (HPGL)
which is used for sending plots to the HP 7550A Plotter located
in Holmes 244. You must use the set term command to set the
terminal to hpgl, as shown:
set term hpgl
In addition to setting the terminal type for Gnuplot, you must
also set the output file. There are two methods to plot your
output to the plotter. You can first save the output to a file
and send that file to the plotter, or you can directly print to
the plotter. In order to send the output to a file, use the
following set output command, substituting your own file name for
set output "filename.hpgl"
You then send that file to the HP 7550A plotter with this
command: (Typed at the Unix prompt)
lp -dhp7550a filename.hpgl
You can also set the output file to plot directly to the plotter.
However, remember to note that you must bring your own paper when
sending the output to the plotter. In order to send the output to
the plotter (thereby bypassing the need to create a plot file),
use the following set output command:
set output "|lp -dhp7550a"
For both of these output methods, the file is not "sent" until
another output (or the same output) file is selected, or until
Gnuplot terminates. After you are done with one plot, simply type
the same set output command to "flush" the file.