线性拟合C语言算法.doc

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1、最小二乘法拟合一条直线（C语言代码） #include#defineN10             //N为要拟合的数据的个数 floatX[10]={1.9,0.8,1.1,0.1,-0.1,4.4,4.6,1.6,5.5,3.4};floatY[10]={0.7,-1.0,-0.2,-1.2,-0.1,3.4,0.0,0.8,3.7,2.0};floatK=0;               //拟合直线的斜率floatR=0;               //拟合直线的截距floatx_sum_average=0;   //数组X[N]个元素

2、求和并求平均值floaty_sum_average=0;   //数组Y[N]个元素求和并求平均值floatx_square_sum=0;    //数组X[N]个个元素的平均值floatx_multiply_y=0;    //数组X[N]和Y[N]对应元素的乘机floatSqure_sum(floatc[N]);floatSum_Average(floatd[N]);floatX_Y_By(floatm[N],floatn[N]);floatSqure_sum(floatc[N]);voidLine_Fit(void);voidLine_Fit(void){ 

3、 x_sum_average=Sum_Average(X);  y_sum_average=Sum_Average(Y);  x_square_sum=Squre_sum(X);  x_multiply_y=X_Y_By(X,Y);  K=(x_multiply_y-N*x_sum_average*y_sum_average)/(x_square_sum-N*x_sum_average*x_sum_average);  R=y_sum_average-K*x_sum_average;  printf("K=%f",K);  printf("R=%f",R)

4、;}floatSum_Average(floatd[N]){unsignedinti=0;floatz=0;for(i=0;i

5、z;}voidmain(void){    Line_Fit();}