Re: [Gnuplot-info] Plot one additional point, manually

[Stephen W. <ste...@in...>]

Allan Felipe wrote:
> Hi, I would like to plot a set of points which is being generated by a C
> code, using pipe. It would plot a sequence of these points making a video.
> Here is an example that does the job:
>
> ----------------------------------------------------------------
>
> #include<stdio.h>
> #include<stdlib.h>
> #include<unistd.h>
>
> int main() {
>
>      FILE *pipe;
>      pipe = popen("gnuplot -persist", "w");
>
>      fprintf(pipe, "set xlabel 'x (m)' \n");
>      fprintf(pipe, "set ylabel 'y (m)' \n");
>      fprintf(pipe, "set pointsize 1 \n");
>      fprintf(pipe, "set xrange[-0.1:4.1] \n");
>      fprintf(pipe, "set yrange[-0.1:4.1] \n");
>
>      int i;
>      double x, y;
>
>      for (i = 1; i<  30; i++) {
>          x = (double) rand() / RAND_MAX;
>          y = (double) rand() / RAND_MAX;
>
>          fprintf(pipe, "plot '<  echo %lf, %lf' w p pt 7 lc -1 notitle \n",
> 4*x, 4*y);
>
>          fflush(pipe);
>          usleep(150000);
>      }
>
>      fclose(pipe);
>      return 0;
> }
>
> -------------------------------------------------------------------------------------
>
> It works ... however, the way it is done, it plots just one point at a time.
> I would like to plot one point, then another one, but keeping the last point
> ... then another, keeping all the other 2 ... so I'd like to know how I
> could add one point to a graph that is already done, that would solve my
> problem.
>    
I make animations using a fortran calling code
for each time step (while the code is ececuting).

  call SYSTEM("/usr/bin/gnuplot explosion.gnu")

Each time step adds an additional point.
Hope this helps,
Stephen


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