gnuplot添加直线和箭头

http://blog.csdn.net/bill_chuang/article/details/18215051

6、在图中添加直线和箭头

gnuplot> set arrow from 0.0,0.0 to 0.6,0.8    %从（0.0,0.0）到（0.6,0.8）画一个箭头
gnuplot> set arrow from 0.0,0.0 to 0.6,0.8 lt 3 lw 2   %这个箭头颜色类型为3，线宽类型为2
gnuplot> set arrow from 0.0,0.0 to 0.6,0.8 nohead lt 3 lw 2  %利用nohead可以去掉箭头的头部，这就是添加直线的方法。