压缩文件中包含五个matlab程序，可用于求解信号与系统常用信号（如双边、单边指数信号、门函数等）的傅立叶变换并图形显示变换结果-compressed file contains five Matlab procedures, can be used for signal and the signal system used (such as bilateral, unilateral index signal gate function) of the Fourier transform and graphics transform results