www.pudn.com > MATLABpro.rar > Untitled9.m

X=0:pi/20:pi; 
Y=sin(X); 
x1=0.5:0.2:1.9; 
y1=[0.4794,0.6442,0.7833,0.8912,0.9636,0.9975,0.9917,0.9463]; 
x=0.6:0.2:1.8; 
L=Langrange(x1,y1,x); 
s=fx(x1,y1,x); 
sm=sanci2(x1,y1,x) 
plot(X,Y,'r'); 
hold on; 
plot(x,L,'gd',x,s,'b+',x,sm,'co'); 
xlabel('X'); 
ylabel('Y'); 
legend('原图像','Langrange','线性插值','样条插值');