Lagrange Interpolating Polynomial Function

Question

0 个投票

I'm trying to write MATLAB code that outputs a Lagrange Interpolating Polynomial. I'll include my code below, although its definitely not refined yet. I was planning on making an array of functions, but I just noticed that matlab doesn't accept functions in arrays. Is there a way around this?

x = [-1 2 3 5]
y = [0 1 1 2]
n = length(x)
f = @(x) x;
array = ones(1,(n-1));
for k = 0: n-1
    for i = 0 : n-1
        if i ~= k
            array(k) = array(k) * (f(x)-x(i))/(x(k)-x(i))
        end
    end
end
array