非常好用的MATLAB程序

				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');