数值线性代数中的列主元gauss消去法、对称正定矩阵的cholesky消去法、Vandermonde方程组以及Toeplitz方程组求解算例以及程序(The column principal element gauss elimination method in the numerical linear algebra, the cholesky elimination method of the symmetric positive definite matrix, the Vandermonde equations and the Toeplitz equations, and the code)