how to add element in a vector ?

i want to create a 20 random binary matrix where in every one from these matrix i want to do some calculation

after that i want to find the min value from all matrix and after that i want to return the matrix which have the min value

like that

A =  [ 1 1 0 1
       0 0 1 0
       1 0 1 0
       0 1 1 0 ]

for k=1:20 
 s = randi([0 1],n,m)
 z(k) = (sum(sum(A ~= s)));

 end

then i want to find the min value from all matrix and after that return the matrix which have the min value like that

 if z = [ 4 4 5 3 2 5 7 8 9 7 9 7 8 9 7 5 4 1 7 ]
then i want from the function to return the matrix number 19 because the value of 19 is the min value like that

 s19 = [ 1 1 0 1
         0 0 1 0
         0 0 1 0
         0 1 1 0 ]

Answer 1

[Guillaume]

The simplest way would be to generate all 20 random matrices in one go as pages of a 3D matrix:

A =  [ 1 1 0 1
       0 0 1 0
       1 0 1 0
       0 1 1 0 ];

nummatrices = 20;
S = randi([0 1], [size(A), nummatrices]); %Sk is S(:, :, k)
z = squeeze(sum(sum(bsxfun(@ne, S, A), 1), 2)) %compare A to each page with bsxfun and sum in two dimensions
[zmin, minidx] = min(z)  %find location of minimum  in z
Smin = S(:, :, minidx)  %and return that page

[Firas Al-Kharabsheh]

thank you

[Firas Al-Kharabsheh]

how can i return the second min value matrix ??