How to create n consecutive for loops in MATLAB

I want to create n for loops such as

for a_1=1:2
   do
   for a_2=1:2
      do
      ....
          for a_n=1:2
              do
         end
      .....
    end
end

[KSSV]

Write them ..simple.....

First you need to think are so many loops necessary? In MATLAB we can avoid lot of loops by vectorization.

Answer 1

[Walter Roberson]

See https://www.mathworks.com/matlabcentral/answers/357969-using-recursive-function-to-calculate-all-possible-peptide-combinations#answer_282766