中文说明：
详细介绍了matlab插值与拟合方法，包括拉格朗日多项式插值、牛顿插值、分段线性插值、Hermite插值和三次样条插值和曲线的最小二乘拟合、多项式拟合方法、最小二乘优化所有程序均有相应的说明与应用实例。
English Description：
Matlab interpolation and fitting methods are introduced in detail, including Lagrange polynomial interpolation, Newton interpolation, piecewise linear interpolation, Hermite interpolation and cubic spline interpolation, curve least squares fitting, polynomial fitting method and least squares optimization. All programs have corresponding instructions and application examples