How can i plot graph in gnuplot-fortran progarm?

To plot a graph in a Gnuplot-Fortran program, you typically write your data to a file in a format that Gnuplot can read, such as plain text or CSV. Then, you can call Gnuplot from your Fortran code using system commands to execute a Gnuplot script or command that specifies how to display the data. For example, you might use SYSTEM('gnuplot -p -e "plot 'data.txt' using 1:2 with lines"') to plot the data from the file data.txt. Ensure Gnuplot is installed and accessible in your system's PATH for this to work.