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From: sfeam <sfeam@users.sourceforge.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Zero-order hold interpolation
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Date: Tue, 26 Apr 2011 09:35:53 -0700
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Jonathan Drolet wrote:
> 
> I'm looking to plot values from a datafile with lines; this part is
> quite easy with gnuplot. My problem, however, is that gnuplot will
> linearly interpolate between datapoints. This is usually what I need,
> but for this particular plot, I want the line to be constant between
> two datapoints (zero-order hold interpolation), but can't seem to
> figure out an easy way to do this.
> 
> Is there a way to do this with gnuplot?

Plot styles "steps", "fsteps", and "histeps" are all variants on what
you want.
 
   http://gnuplot.sourceforge.net/demo/steps.html