自己编写的伯德图、尼奎斯特图、根轨迹图的Matlab绘图程序，虽然小、简单，却很实用。便于大家教学中分析习题。-I have written Byrd map, Nyquist diagram, root locus diagram of the Matlab graphics program, although small, simple, very practical. Facilitate the analysis of U.S. teaching exercises.