基于MATLAB 6.x开发，通过鼠标点击拖拽可以画出带箭头的线段。-ARROW may be called with a normal argument list or a property-based list.　　　ARROW(Start,Stop,Length,BaseAngle,TipAngle,Width,Page,CrossDir) is　the full normal argument list, where all but the Start and Stop　 points are optional.　If you need to specify a later argument (e.g.,

Page) but want default values of earlier ones (e.g., TipAngle), pass an empty matrix for the earlier ones (e.g., TipAngle=[]).