主要为数据分析和统计，一个很有用的程序，匹配追踪和正交匹配追踪，借鉴了主成分分析算法（PCA），微分方程组数值解方法。-Mainly for data analysis and statistics, A very useful program, Matching Pursuit and orthogonal matching pursuit, It draws on principal component analysis algorithm (PCA), Numerical solution