如：根据数据表，用最小二乘法求三次多项式342321xcxcxccy拟合这组数据。 数据表 x 0 1 2 3 4 5 6 7 8 y 1 2.5 2 1 3 5 5.5 4 3 #include "stdio.h" #include "conio.h" #include "stdlib.h" #include "math.h" #define N 9 #define M 2 #define K 2*M void zhuyuan (int k,int n,float a[M+1][M+2]) { int t,i,j; float x,y; x=fabs(a[k][k]);t=k; for (i=k+1;i<=n;i++) if (fabs(a[i][k])>x) {x=fabs(a[i][k]);t=i;} for (j=k;j<=n+1;j++) {y=a[k][j];a[k][j]=a[t][j];a[t][j]=y;} } void xiaoyuan(int n,float a[M+1][M+2]) { int k,i,j; for(i=0;i=0;i--) { x[i]=a[i][n+1]; for (j=i+1;j<=n;j++) x[i]=x[i]-a[i][j]*x[j]; x[i]=x[i]/a[i][i]; } } void main() {float x_y[N][2],A[N][K+1],B[N][M+1],AA[K+1],BB[M+1],a[M+1][M+2],m[M+1]; int i,j,n; printf("Please inqut %d\n",N); for(i=0;i
