function Lagrange_main()
clc
x=0:1:10;
y=x./(cos(x)+1);
k=1;
for x0=0:0.1:10;
y0(k)=Lagrange(x,y,x0);
k=k+1;
end
x0=0:0.1:10;
plot(x0,y0)
hold on
scatter(x,y,'ro')
msgbox('MATLAB编程答疑，请加QQ: 993878382','MATLAB答疑','help')
web http://993878382.qzone.qq.com -browser
end
function y0=Lagrange(x,y,x0)
n=length(x);
l=ones(1,n);
for k=1:n
for j=1:n
if j~=k
l(k)=l(k)*(x0-x(j))/(x(k)-x(j));
end
end
end
y0=sum(y.*l);
end
