对信号进行频谱分析及滤波，用于信号特征提取、信号消噪，包含优化类的几个简单示例程序，进行逐步线性回归，快速扩展随机生成树算法，计算加权加速度。-The signal spectral analysis and filtering, For feature extraction, signal de-noising, Optimization class contains several simple sample programs, Stepwise linear regression, Rap