plot.cr

module Plot

  gnuplot = Process.new(command: "gnuplot", input: Process::Redirect::Pipe, output: Process::Redirect::Inherit)
  input = gnuplot.input
  
  # file out
  input << "set terminal png\n"
  input << "set output \'sin.png\'\n"
  
  # plot
  input << "set xrange [-10:10]\n"
  input << "set yrange [-1:1]\n"
  input << "plot sin(x)\n"
  
  #exit
  input << "exit\n"
  input.flush
  input.close

  gnuplot.wait
end