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

Question

Dominic Garcia 2020-11-16

0
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https://ww2.mathworks.cn/matlabcentral/answers/648978-the-variable-appears-to-change-size-on-every-loop-iteration-so-my-variable-w-this-happens

回答： Walter Roberson 2020-11-16

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