主要涉及以下知识点：分片二次插值、非线性方程组的解法、线性方程组的解法、曲面拟合、最小二乘拟合、矩阵的求逆、计算向量的无穷范数等。-Knowledge involves the following points: piecewise quadratic interpolation, solution of nonlinear equations, solution of linear equations, surface fitting, least squares fitting, matri