lagran.m

来自「一些matlab程序」· M 代码 · 共 17 行

function[c,l]=lagran(x,y)
clear all
x=[0 1 2 3]';
y=[0 1 5 14];
w=length(x);
n=w-1;
l=zeros(w,w);
for k=1:w
    v=1;
    for j=1:w
        if k~=j
            v=conv(v,poly(x(j)))/(x(k)-x(j));
        end
    end
    l(k,:)=v;
end
c= y*l