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From: "F. Russell" <fr@random.info>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Is Subsecond Pause Possible?
Date: 14 May 2017 18:47:48 GMT
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Xref: csiph.com comp.graphics.apps.gnuplot:3645

On Sun, 14 May 2017 10:54:21 -0700, Ethan A Merritt wrote:

> 
> I am pretty sure you want "plot ..." rather than "replot...",
> or else you want "replot;" with no trailing functions.
> 
> As it stands your "replot" instruction creates a longer plot sequence
> each time it executes, so by the end of your loop it is drawing
> 400 plots on top of each other per iteration.  I can see how
> that might slow it down.  
> 

Thank you for that explanation.  It does solve the problem.

I need to set up a different graph before the animation
and so I can't use "plot" command in the animation because it will
destroy the original graph.  I need to use the "replot" command. 

But now I can just plot the original graph and then plot the initial
point of the animation using "replot f(t), g(t)".  Then I run the
rest of the animation only "replot;".

set parametric
# plot the first graph
set trange [0:2*pi]; plot cos(t), sin(t) with lines lw 8

#plot the initial point of the animation with "replot f(t), g(t)" 
a_time=0
replot f(a_time), g(a_time) with points pt 7 ps 2 lc 2

# perform the animation with just "replot;"
do for [i=1:400] { \
a_time=a_time+0.01;
replot; \
pause 0.3 }

Now the pauses are less than 1 second and the animation runs
smoothly.

Thanks again.