gnuplot limitations

 
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Old 09-03-2009
gnuplot limitations

I'm running a simulation (programmed in C) which makes calls to gnuplot periodically to plot data I have stored.

First I open a pipe to gnuplot and set it to multiplot:

FILE * pipe = popen("gnuplot", "w");
fprintf(pipe, "set multiplot\n");
fflush(pipe);

(this pipe stays open until the end of the program when I open it)

Next I use fopen to open a file called "plot". Write all the commands I want to have plotted (there's quite a few of them as many of them are just plotting 1 point with a specific color and point style). Once I've written all the commands to plot I close "plot"

Then I use the pipe again to load my file

fprintf(pipe, "load \"plot\"\n");

I'm running it like this so I can constantly plot on the same window and see my plots in real time as the program runs.

Functionally it works but a delay starts to build up and eventually becomes extremely significant.

My load commands are generally on the order of 2000 lines.

So to actually get to a question, does gnuplot have strange behavior for very large loads or can plot take a long time with that. My guess is that my program is piping loads to gnuplot before previous commands are finished completing. Has anyone had experience with this kind of situation, or can anyone suggest a better method for real time plotting in C.
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GPIV_PIV2GNUPLT(1)					      General Commands Manual						GPIV_PIV2GNUPLT(1)

NAME
gpiv_piv2gnuplt - Converts PIV data gnuplot data. SYNOPSIS
gpiv_piv2gnuplt [-al int] [-au int] [-h | --help] [-p | --print] [-s float] [-v | --version] [-z] filename DESCRIPTION
gpiv_piv2gnuplt converts PIV data to gnuplot vectors for displaying and printing PIV the estimators in a graphical way. This program does not use the parameter resources from libgpiv. The parameters may be defined by the command line options as explained below. Options -al L Draws an annotation vector with length L. -al UNIT Define unit of annotation vector (defaul m/s). -h | --help On-line help. -p | --print Prints parameters to stdout. -s SCALE Scale factor for graphic output with gnuplot. -v | --version Print version information on standard output, then exits successfully. -z Full zoom (for scaled data). filename Filename containing the input PIV data. SEE ALSO
gpivtools AUTHOR
Gerber Van der Graaf 9 November 2006 GPIV_PIV2GNUPLT(1)