'the variable appears to change size on every loop iteration' So my variable W, this happens

So my variable W, this happens...The code "The variable 'W' appears to change size on every loop iteration...'

I don't know how to fix it. Basically in this code, there is an matrix of 20 by 20 zeros. And a random zero is added with 1 on each loop. 1 can be added to make it 2 or 3.

When at least half of the zeros are not zeros anymore, it puts out the message. Same for all. Need help with 'W', thanks.

real = false;
game = 0;
hit = 0;
while real == false
   game = game + 1;
   ro = randi (20);
   co = randi (20);
   W(ro,co) = W(ro,co) + 1;
   hit = 0;
   for rscan = 1:20
       for cscan = 1:20
           if W(ro,co)>= 1
               hit = hit + 1;
           end
       end
   end
   if hit == 200
       fprintf('%i days have passed for half of the window to have impact', game)
   end
   if hit == 400
       fprintf('%i days have passed for all of the window to have impact', game)
   end

end

[Geoff Hayes]

Hassan - according to the code, I think that W should never be more than a 20x20 array. Why do you think it is changing size?

[Dominic Garcia]

Apparently, Matlab keeps giving the message, 'The variable 'W' appears to change size on every loop iteration..'...

Answer 1

[Walter Roberson]

Before the loop do

W = zeros(20,20);