中文说明： 利用matlab GUI实现的串口编程例子，包括调制，解调，信噪比计算，isodata 迭代自组织的数据分析，该函数用来计算任意函数的一阶偏导数(数值方法),数学方法是部分子空间法，利用贝叶斯原理估计混合logit模型的参数。
English Description：
Serial port programming using MATLAB GUI example, including modulation, demodulation and signal to noise ratio, analysis of isodata iterative self organizing data, this function is used to calculate the first order partial derivatives of a function (method), mathematical methods are part of the subspace, using Bayesian principles to estimate parameters of the mixed logit model.