knoten_einfuegen

function [P] = knoten_einfuegen(x,y,knotennummer)
    P(knotennummer+1,1) = x;
    P(knotennummer+1,2) = y;
    [sr,sc] = size(P);
    n = knotennummer + 1;
    for i = n:sr
        P(i,1) = P(i-1,1);
        P(i,2) = P(i-1,2);
    end
end