MATLAB: Subtraction bwtween rows of a field

Question

I have a very simple code as following

for i=1:100

datafiles{i}= load(sprintf('%d.mat', i));

for k=1:611

bond_vec(k,:)=datafiles{i}(1).xyz(k+1,:) – datafiles{i}(1).xyz(k,:);

end

bond_vectors{i}=(bond_vec);

end

yet it gives error as if sizes do not compare. I can't see what the problem is can anyone help? thanks

Unable to perform assignment because the size of the left side is 1-by-2 and the size of the right side is 1-by-3.

Answer 1

Before all the loops

 bond_vec = cell(100, 611);

Inside the second loop

 bond_vec{ii, k} = ... rest remains unchanged

Remove

 bond_vectors{i}=(bond_vec);