How to add element to cell array directly in matfile?

I have got a matfile with cell array. So I want ta add the next element to my cell array, but I can't do something like I wrote below(see code), because the data is big and doing it in loop would be very expensive:

cell_array = m.cell_array; % m is matfile object containig cell
cell_array{end + 1} = c; % c is element which I want to add
save('filename', 'cell_array');

How can I do it directly without loading loading and saving the variable?

Answer 1

[Guillaume]

You can't do it directly. You have to load the whole cell array, modify it and write it back as you have done. The documentation is very clear on this:

"matfile does not support indexing into:

• Cells of cell arrays"