gusucode.com > 《MATLAB神经网络超级学习手册》随书光盘源码程序 > code/2/ANN2_26.m
x=[-3:1:3]'; y=[1.1650 0.0751 -0.6965 0.0591 0.6268 0.3516 1.6961]'; [x,i]=sort(x); y=y(i); xi=min(x)+[0:100]/100*(max(x)-min(x)); for i=1:4 N=2*i-1; [th,err,yi]=polyfits(x,y,N,xi); subplot(2,2,i) plot(x,y,'o') hold on plot(xi,yi,'-') grid on end