///<summary>
name="arrX">已知点的x坐标集合</param>
name="arrY">已知点的y坐标集合</param>
name="length">已知点的个数</param>
name="dimension">方程的最高次数</param>
static double[] MultiLine(double[] arrX, double[] arrY, int length, int dimension)//二元多次线性方程拟合曲线
n = dimension + 1;
dimension+1个 系数
Guass=new double[n,n+1];
例如:y=a0+a1*x+a2*x*x
i=0;i<n;i++)
j;
= SumArr(arrX, j + i, length);
= SumArr(arrX,i,arrY,1,length);