matlab求解拉格朗日方程怎么编程在matlab中求解带未定乘子的拉格朗日方程怎么编程?有已编出来

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拉格朗日function y=lagrange(x0,y0,x)
n=length(x0);m=length(x);
for i=1:m
z=x(i);
s=0.0;
for k=1:np=1.0;
for j=1:n
if j~=k
p=p*(z-x0(j))/(x0(k)-x0(j));
endends=p*y0(k)+s;
endy(i)=s;
end