Making C code plot a graph automatically

user_406912 0
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I have written a program which writes a list of data to a '.dat' file with the intention of then plotting it separately using gnuplot. Is there a way of making my code plot it automatically? My output is of the form:

x-coord    analytic    approximation
x-coord    analytic    approximation
x-coord    analytic    approximation
x-coord    analytic    approximation
x-coord    analytic    approximation
 ....

Ideally, when I run the code the graph would also be printed with an x-label, y-label and title (which could be changed from my C code). Many thanks.

piping numerical-methods gnuplot c
5 Answers

I know it's too late, but answering if it may help someone. fputs really does the job, you want. first you need to print the data you want to plot in a temporary file data.temp.

FILE *pipe_gp = popen("gnuplot -p", "w");
fputs("set terminal png \n",pipe_gp);
fputs("set output 'abc.png' \n",pipe_gp);
fputs("set xlabel 'f' \n",pipe_gp);
fputs("set xrange [0:100] \n",pipe_gp);
fputs("set yrange [0:100] \n",pipe_gp);
fputs("plot 'data.temp' u 1:2 w circles lc rgb 'pink' notitle \n",pipe_gp);
pclose(pipe_gp);
user_108055530
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