Searching using loop in matlab

I have n (number of particles) = 1:10. These particles flow in the system and i want to check if for certain condition is satisfied, then the particles collide and I compute collision. Importantly, I have to check every possible combinations of n for collision to happen. Any suggestions on how can I do this in a loop ?

[KL]

what is your condition?

[Jan]

Is the number of particles 1:10 or simply 10?

Answer 1

[Jan]

Perhaps you mean this:

for i1 = 1:10
   for i2 = 1:10
    if i1 ~= i2
      check collision between the particle i1 and i2
    end
  end
end