功能：离散试验数据点的多项式曲线拟合

调用格式：A=multifit(x,y,m)

其中：x: 试验数据点的x坐标向量

　　　Y: 试验数据点的y坐标向量

m: 拟合多项式的次数

-Functions: discrete experimental data points, the polynomial curve fitting call format: A = multifit (x, y, m) where: x: experimental data points, x-coordinate vector Y: experimental data points y coordinates of vector m: Fitting the number of polynomials