MATLAB: Operations between every 2 different elements in a cell

cellforloop

Hi all,
I have a cell like this:
K>> ur
ur =
    4×3 cell array
      {[1]}    {'-1 -1'}    {1×201 cell}
      {[2]}    {'1 -1' }    {1×201 cell}
      {[4]}    {'1  1' }    {1×201 cell}
      {[3]}    {'-1  1'}    {1×201 cell}
I'd like to perform some operations between every 2 elements of the 3rd column of ur, manually be like this:
operation(ur{1, 3}, ur{2, 3}) % 1 and 2
operation(ur(1, 3), ur(3, 3)) % 1 and 3
operation(ur(1, 3), ur(4, 3)) % 1 and 4
operation(ur(2, 3), ur(3, 3)) % 2 and 3
operation(ur(2, 3), ur(4, 3)) % 2 and 4
operation(ur(3, 3), ur(4, 3)) % 3 and 4
The number of cell rows is not limited to 4. Is there a way to do this in a loop? Or whatever automatic? I think I just need to pick the correct index to perform the operation, but how?
Many thanks!
Edit: the operations should all be curly brackets:
operation(ur{m, 3}, ur{n, 3}) % m and n

Best Answer

Maybe you mean:
index = nchoosek(1:4, 2);
for k = 1:size(index, 1)
  operation(ur{index(k, 1), 3}, ur{index(k, 1), 3});
end
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