最小二乘法拟合一条直线(C语言代码).doc

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1、最小二乘法拟合一条直线(C语言代码)#include#defineN9            //N为要拟合的数据的个数 floatX[9]={1,1.477,1.778,2,2.176,2.301,2.398,2.477,2.638};floatY[9]={7.55,8.02,8.41,8.64,8.75,8.79,8.81,8.83,8.87};floatK=0;               //拟合直线的斜率floatR=0;               //拟合直线的截距floatx_sum_average=0;  

2、 //数组X[N]个元素求和并求平均值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(voi

3、d);voidLine_Fit(void){  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;  print

4、f("K=%f",K);  printf("R=%f",R);}floatSum_Average(floatd[N]){unsignedinti=0;floatz=0;for(i=0;i

5、atz=0;for(i=0;i