几种常用的数值计算算法，包括高斯消去法、追赶法、高斯赛德尔法求解线性方程组，矩阵的LDL分解和cholesky分解，牛顿插值法和三次样条插值法的matlab实现-Several commonly numerical algorithms, including Gaussian elimination, catch method, high Sisaideer method for solving linear equations, matrix LDL decomposition and cho