plotting large datasets  Rick Walker walker at Sat Aug 22
02:03:43 UTC 2009  > > I've got a need to plot "value vs time"
data for 32 channels > > simultaneously.  Gnuplot isn't up to
the task (not enough uniqueness, > > even mixing lines and
points, or control - the graph is just a mess). > > What else is
there?  You might try the pdplot program at  It takes ascii
datafiles and plots them to X11, postscript or PNG.  The file
format is x,y ascii data interspersed with commands like:
title my plot     xscale 1 time     yscale 1 voltage     0 0
1 1     3 3     yscale 1 current     0 8     2 2     3 4
yscale 1 pressure     0 -1     3 3.99  the pdplot program is a
daemon associated with a persistant plot window.  You
communicate with the daemon by sending data to it with "pd".
For instance, to plot the above file you'd save it as "myplot"
and do one of the following:      pd myplot     cat myplot | pd
If you want to add new data to an already existing plot you cat
do it with "cat newdata | pd -n".