LED显示屏在交通控制中采用广泛，如图1（a-b）试设计一个矩形LED显示屏（软件模拟），并能显示至少5种不同的交通标识-LED display in the traffic control used in a wide range of Figure 1 (ab) try to design a rectangular LED display (software simulation), and can show at least five kinds of different traffic

matlab 实现直线拟合并计算直线夹角-matlab achieve a straight line to be merged to calculate the angle between the straight line