the variable 'cc' appears to change size on every loop iteration matlab

Question

I have this code source for tarjan program with Matlab , this error appears when I run the prog , how can I fix it

function [C, S, idx, index, index_accessible] = strongconnect(C, G, v, S, idx, index,       index_accessible)
index(v) = idx;
index_accessible(v) = idx;
idx = idx+1;
S = push(S,v); %ajouter le sommet courant à la pile

% Liste les sommets adjacents au sommet courant
n = voisin(G,v);

% Parcours récursif
for i = 1:length(n)
    if(index(n(i)) == 0)
        [C, S, idx, index, index_accessible] = strongconnect(C, G, n(i), S, idx, index,  index_accessible);
        index_accessible(v) = min(index_accessible(v), index_accessible(n(i)));
    elseif (~isempty(find(S == n(i), 1)))
        index_accessible(v) = min(index_accessible(v), index(n(i)));
    end
end

% Le sommet est une racine, on calcule la composante fortement connexe associée
if(index_accessible(v) == index(v))
    cc = []; %composante fortement connexe issue du sommet
    if(~isempty(S))
        [tmp, S] = pop(S);
        cc = [cc tmp];
    end
    while(~isempty(S) && tmp ~= v)
        [tmp, S] = pop(S);
        ***cc*** = [cc tmp];
    end
    if(~isempty(cc))
        % Les composantes connexes n'ont pas toutes
        % la même longueur. On complète donc la ligne
        % avec des 0.
        C = [C ; cc zeros(1,size(G,1) - length(cc))];
    end
end
end

the problem is with the cc between stars

Answer 1

There is no error in the code. The input is a graph matrix, I used a random generated one:

G=randi(10,20,20)==1;

Now call the function:

C=tarjan(G);

Each row of C contains one component.

If this does not answer your question, please update it including a error description and your input data.