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Full Discussion: gnuplot limitations
Special Forums UNIX and Linux Applications gnuplot limitations Post 302350375 by sedavidw on Thursday 3rd of September 2009 03:20:58 PM
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.
 
Test Your Knowledge in Computers #274
Difficulty: Easy
OpenSolaris is a descendant of the UNIX System V Release 4 (SVR4) code base developed by Sun and AT&T in the late 1980s.
True or False?

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GPIV_SSTRAIN(1) 					      General Commands Manual						   GPIV_SSTRAIN(1)

NAME
gpiv_sstrain - Calculates the shear strain from PIV data. SYNOPSIS
gpiv_sstrain [-d N] [-h | --help] [--no_g ] [-p | --print] [-g | --g] [-v | --version] [filename] < stdin > stdout DESCRIPTION
gpiv_sstrain calculates the shear strain from PIV data. You can choose from several differential schemes: central differentiation, least squares and Richardson extrapolation. The output can be generated as ASCII data containing four columns or as GNUPlot Data format that allows one to view/print the data as contour plots. The configuration parameters (containing the POST key) may be overruled by the command line options, as explained below. Options -d N Differential type to be used: central difference (N=0), least squares (N=1), Richardson interpolation (N=2), circulation method (N=3) -h | --help On-line help -p | --print Print parameters, command line options and eventually used input and output filenames to stdout. The output is identic of file- name.par, in case filename is used. -g Show contour plot of the output with gnuplot. --no_g Suppresses to show contour plot of the output with gnuplot. -v | --version Print version information on standard output, then exit successfully. filename Input PIV data file. Overrides stdin and stdout. The output will be written to filename.sstr. Parameters are stored in filename.par and may be used for future use by including them in ./gpivrc. SEE ALSO
gpivtools AUTHOR
Gerber Van der Graaf 8 November 2006 GPIV_SSTRAIN(1)

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