利用MATLAB，通过迭代法实现拉格朗日插值程序，并计算迭代误差——用于高等工程数学-Using MATLAB, the Lagrange interpolation program is realized by the iterative method, and the iteration error is calculated.

掌握用MATLAB计算拉格朗日,分段线性,三次样条三种插值的方法-Master the MATLAB computing Lagrange, piecewise linear, three kinds of cubic spline interpolation method