改进后的高斯信号发生函数，可用于字符运算。-Improved Gaussian signal, can be used for computing characters.

仿照正态分布normpdf，写的一个柯西分布概率密度函数-Cauchy P.D.F

HISTNORM Histogram normalized [...] = HISTNORM(...) works like HIST, but the frequency is normalized so that area sum is 1. Bonus usage! [...] = HISTNORM(..., plot ) plots and returns the output argument