lagrintyy.m

可以方便的调用这个函数

year=[1986 1988 1990 1992 1994 1996]';
price=[133.5 132.2 138.7 141.5 137.6 144.2]';
y=linspace(min(year),max(year),200);
p=zeros(size(y));
for i=1:length(y)
    p(i)=lagrangen(year,price,y(i));
end
plot(year,price,'o',y,p,'-');
xlabel('year');
ylabel('gasoline price,(cents)');