error in matlab, cellfun, display image

Hello, i have a problem with cellfun

my code:

Z = cellfun(@(Z) Z', Z,'Un',0);
Z = cellfun(@(Z) cell2mat(Z), Z,'Un',0);
Z = cellfun(@(Z) sub2ind(size(I) , Z(:,1) , Z(:,2)), Z,'Un',0);
figure;
cluster = zeros(size(I));
for ii = 1:length(Z)
      cluster(Z{ii}) = ii;
end

imshow(label2rgb(cluster))
title('Vystupny obraz - Metoda KMEANS','FontSize',16,'Color','k');

error:

??? Attempted to access Z(:,2); index out of bounds because size(Z)=[952,1].

Error in ==> KMNSimage>@(Z)sub2ind(size(I),Z(:,1),Z(:,2)) at 503
Z = cellfun(@(Z) sub2ind(size(I) , Z(:,1) , Z(:,2)), Z,'Un',0);

Error in ==> KMNSimage at 503
Z = cellfun(@(Z) sub2ind(size(I) , Z(:,1) , Z(:,2)), Z,'Un',0);

Z is :

Z={1x952 cell}    {1x3141 cell}    {1x3141 cell}    {1x3141 cell}

know someone help ?

Thanks.