中文说明：怎么用matlab画箭头的直线呢？看看这个程序，也许你能用得上，程序写了一段代码，代码在直线的一头画了箭头符号！
English Description：
How to draw arrow line with MATLAB? Take a look at this program, maybe you can use it. The program wrote a piece of code, and the code drew an arrow symbol at one end of the line!