im uploading two codes which have different outputs. Wats the difference between these two pieces of code. I mean , why there outputs are different . Shudn't outputs be same ?

Question

Amir 2015-2-26

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关闭： MATLAB Answer Bot 2021-8-20

if true
  % code
block=20*ones(200);
block1=60*ones(500);
block2=100*ones(500);
block3=150*ones(500);
block1(151:350,151:350)=block;
img1=uint8(block1);
subplot(2,3,1)
imshow(img1)  
block2(151:350,151:350)=block;
img2=uint8(block2);
subplot(2,3,2)
imshow(img2) 
block3(151:350,151:350)=block;
img3=uint8(block3); 
subplot(2,3,3) 
imshow(img3)
end
if true
  % code
A=60*ones(500);
B=120*ones(500);
C=200*ones(500);
A(151:350,151:350)=20*ones(200);
subplot(2,3,1)
imshow(uint8(A))
B(151:350,151:350)=20*ones(200)
subplot(2,3,2)
imshow(uint8(A))
C(151:350,151:350)=20*ones(200)
subplot(2,3,3)
imshow(uint8(A))
end

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Answer 1

Guillaume 2015-2-26

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Well, in your second piece of code, you're showing A three times. If you show A, B and C you get the same figure as in the first piece:

figure; 
subplot(2,3,1); 
imshow(uint8(A)); 
subplot(2,3,2); 
imshow(uint8(B)); 
subplot(2,3,3); 
imshow(uint8(C));

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Answer 2

sandhya 2015-2-26

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https://ww2.mathworks.cn/matlabcentral/answers/180448-im-uploading-two-codes-which-have-different-outputs-wats-the-difference-between-these-two-pieces-of#answer_169369

编辑：sandhya 2015-2-26

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Rather your second code should be

if true
  % code
A=60*ones(500);
B=120*ones(500);
C=200*ones(500);
A(151:350,151:350)=20*ones(200);
subplot(2,3,1)
imshow(uint8(A))
B(151:350,151:350)=20*ones(200)
subplot(2,3,2)
imshow(uint8(B))
C(151:350,151:350)=20*ones(200)
subplot(2,3,3)
imshow(uint8(C))
end