Linear Least squares MATLAB s=(1950:10:2000)-1950)/50 =[150.6970179.3230203.2120226.5050 24963302814220y XIS. *s s ones(size(s) R c=qrsteps(x,y) beta=R(1: 3, 1: 3)c(1: 3)%beta=Ric p2010=polyval(beta, 1.2 想一下,c(46)有什么用处?s=((1950:10:2000)'-1950)/50; y=[150.6970 179.3230 203.2120 226.5050 249.6330 281.4220]'; X=[s.*s s ones(size(s))] [R,c]=qrsteps(X,y) beta=R(1:3,1:3)\c(1:3) %beta=R\c p2010=polyval(beta,1.2) Linear Least Squares 想一下，c(4:6)有什么用处？