BDS_01的博客

1.最小二乘拟合基本理论对一组数据(xi,yi),i=1,2⋯ ,m(x_i,y_i),i=1,2\cdots,m(xi​,yi​),i=1,2⋯,m，要在某个函数类Φ={ϕ0(x),ϕ1(x),⋯ ,ϕn(x)},n≪m\Phi=\{\phi_0(x),\phi_1(x),\cdots,\phi_n(x)\},n\ll mΦ={ϕ0​(x),ϕ1​(x),⋯,ϕn​(x)},n≪m中构造一个函数ϕ(x)=∑k=0nakϕk(x)\phi(x)=\sum_{k=0}^{n}a_k\phi_k(x)ϕ(x)