How to vectorize for loops

Hello.Here's my code.I want to improve it's efficiency. Therefore,I try to vectorize this for loop in this code.Hope anyone who mastering Matlab can help me solve this problem.Thank you all.

 K = 2;
 M = 3;

 b = zeros(K,1);

 A = [1,1,1;
      1,1,2;
      1,2,1;
      1,2,2;
      2,1,1;
      2,1,2;
      2,2,1;
      2,2,2];

 C = num2cell(A);

 for i = 1:M          
    for j = 1:K^M    
        for q = 1:K  % 1 --> [1;0;...;0]  2 --> [0;1;0;0...;0]  K --> [0;0;0;...;1]
            if C{j,i} == q
                b(q,1) = 1;
                C(j,i) = {b};
            end
        end
        b = zeros(K,1);
    end
 end

Answer 1

[Stephen23]

K = 2;
S = size(A);
[R,C] = ndgrid(1:S(1),1:S(2));
Z = zeros([K,S]);
Z(sub2ind([K,S],A,R,C)) = 1;
out = permute(num2cell(Z,1),[2,3,1]);