[Gnuplot-info] Making data line invisible

[steven <st...@he...>]

I am using gnuplot to plot a series of graphs from data files to jpegs
which are used to make a to make an avi  of a rotating 3d plot.  I have
a
number of these to do.

Part of this is to also build up jpegs that only plot parts of the
dataset.  I need to keep the same x,y,& z ranges for each plot or the
movie is impossible to watch as the axis ranges jump around.  I can set
the ranges manually which works fine but this is tedious for more than
one
plot and I have a number to do.

I had the idea I could plot the entire file once but in a way
that is invisible or merges with the background and then plot just that
part of the dataset I am interested in for the particular jpeg over the
top.  This then lets me take advantage of autoscaling and is much
quicker.

An example plot is 

splot '100kmpresc.txt' using 4:5:9 with points pt 0 ps 0 , \
      '< head -$K 100kmpresc.txt' using 4:5:9 with lines

This is one line from a looping shell script which generates several
thousand jpegs plotting various portions of the dataset and rotating
about the z axis.  These are then turned into the avi. I have tried
various combinations of lines and points with ps 0 and lw 0 etc. without
success. Could anyone suggest how to do this or a better approach.

Thank you
Steven