线性回归 c++代码实现

#include "iostream.h" #include "math.h" #include "stdio.h" main() { int n,i; cout<<"请输入x，y个数："; cin>>n; cout<<endl; float x,y; float Lxx = 0; float Lxy = 0; float l1 = 0; float l2 = 0; float l3 = 0; float l4 = 0; for(i = 0;i < n;i ++) { cout<<"请输入(x,y):"<<endl; cin>>x; cin>>y; l1 += x*y; l2 += x; l3 += y; l4 += x*x; } Lxx = l4 - l2*l2/n; Lxy = l1 - l2*l3/n; float a , b; a = Lxy/Lxx; b = l3/n - a*l2/n; cout<<"a = "<<a<<endl; cout<<"b = "<<b<<endl; getchar(); return true; }