说明：  多项式最小二乘法 三弯矩插值法 lagrange多项式插值 多项式最小二乘法 龙贝格积分法 分段线性插值 三转角插值 这些是数值分析中常用的集中经典方法，运用matlab展示出来！
(least squares polynomial interpolation three Moment Hangzhou polynomial interpolation polynomial least-squares method Long Bagby integration piecewise linear interpolation three corner interpolation these numerical analysis is commonly used in concentrated classical method, using Matlab show!)