Incrementing value in an executing loop

I have a matrix A =

12    13     6     7
 5     4     5     1
 2     2    11    13
 7     1     3     6

and the following code:

%%%%(th=threshold)

th=4 
for i=1:4
  for j=1:4
    if A(i,j) < th 
      A(i,j) = 0;
      G=nnz(A);
    end
  end
end

I have calculated nnz where I get G=11,for threshold 4.

Now I want to automatically increment the th value such that if G is less than 5 the loop should termainate, and find the value of th when the loop terminated.

[Albert Yam]

Please reword your question. I don't understand what you are asking.

From what I gather,

• when G == 11, you want th = 8 ?
• when G <= 5 , stop the loop?
• but if you stop the loop what does increasing 'th' do?

Answer 1

[venkat vasu]

th=4 
for i=1:4
      for j=1:4
        if A(i,j) < th 
            A(i,j) = 0;
            G=nnz(A);
              if G<5
                th=th+1;
                break;
              end 
         end
      end
  end

this may help you...

Answer 2

[Andrei Bobrov]

G=5;
th = 0;
while sum(A(:) >= th) >= G
    th = th + 1;
end