Making C code plot a graph automatically

You can either create a gnuplot script and spawn a process running gnuplot to plot this script from the commandline, or you may use one of the provided interfaces. For C, there is a POSIX pipe-based interface from Nicolas Devillard available here: http://ndevilla.free.fr/gnuplot/ ...and an iostream-based C++ version is available via git (see: http://www.stahlke.org/dan/gnuplot-iostream/ )

The most portable and probably the easiest way would still be calling gnuplot to plot a script, though. As sje397 mentioned, check your documentation for the system() call in stdlib.h.

On a sidenote, there is also GNU plotutils, which offers libplot, a library for plotting datasets, which you could use in your application. See: http://www.gnu.org/software/plotutils/

I came across this while searching for something else regarding gnuplot. Even though it's an old question, I thought I'd contribute some sample code. I use this for a program of mine, and I think it does a pretty tidy job. AFAIK, this PIPEing only works on Unix systems (see the edit below for Windows users). My gnuplot installation is the default install from the Ubuntu repository.

#include <stdlib.h>
#include <stdio.h>
#define NUM_POINTS 5
#define NUM_COMMANDS 2

int main()
{
    char * commandsForGnuplot[] = {"set title \"TITLEEEEE\"", "plot 'data.temp'"};
    double xvals[NUM_POINTS] = {1.0, 2.0, 3.0, 4.0, 5.0};
    double yvals[NUM_POINTS] = {5.0 ,3.0, 1.0, 3.0, 5.0};
    FILE * temp = fopen("data.temp", "w");
    /*Opens an interface that one can use to send commands as if they were typing into the
     *     gnuplot command line.  "The -persistent" keeps the plot open even after your
     *     C program terminates.
     */
    FILE * gnuplotPipe = popen ("gnuplot -persistent", "w");
    int i;
    for (i=0; i < NUM_POINTS; i++)
    {
    fprintf(temp, "%lf %lf \n", xvals[i], yvals[i]); //Write the data to a temporary file
    }

    for (i=0; i < NUM_COMMANDS; i++)
    {
    fprintf(gnuplotPipe, "%s \n", commandsForGnuplot[i]); //Send commands to gnuplot one by one.
    }
    return 0;
}

EDIT

In my application, I also ran into the problem that the plot doesn't appear until the calling program is closed. To get around this, add a fflush(gnuplotPipe) after you've used fprintf to send it your final command.

I've also seen that Windows users may use _popen in place of popen -- however I can't confirm this as I don't have Windows installed.

EDIT 2

One can avoid having to write to a file by sending gnuplot the plot '-' command followed by data points followed by the letter "e".

e.g.

fprintf(gnuplotPipe, "plot '-' \n");
int i;

for (int i = 0; i < NUM_POINTS; i++)
{
  fprintf(gnuplotPipe, "%lf %lf\n", xvals[i], yvals[i]);
}

fprintf(gnuplotPipe, "e");