[待总结整理]gnuplot笔记

• https://stackoverflow.com/questions/16435684/draw-points-and-lines-in-gnuplot
  
• https://stackoverflow.com/questions/23177716/in-gnuplot-how-to-label-each-point-in-the-plot-with-its-coordinates
  
• https://www.researchgate.net/post/How_can_I_plot_using_multi-column_as_Y_value_in_Gnuplot
  
• https://stackoverflow.com/questions/16073232/gnuplot-plotting-a-file-with-4-columns-all-on-y-axis
  
• http://www.math.utk.edu/~vasili/refs/How-to/gnuplot.print.html