how to perform xor of two bits in matab

Question

Ayesha Punjabi 2019-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/450113-how-to-perform-xor-of-two-bits-in-matab

编辑： dpb 2019-3-15

I am learning matlab on my own and would be helpful if someone provide me knowledge with it.

j    = mat2str(dec2bin(randi([0,3],5,16)));
sc_o = mat2str(dec2bin(randi([0,3],5,16)));

I want to perform xor of these two matrix in matlab but I am not sure if I can perform it or not. Can someone please provide suggestions regarding it??

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Answer 1

dpb 2019-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/450113-how-to-perform-xor-of-two-bits-in-matab#answer_365424

在 MATLAB Online 中打开

See

doc bitxor

to do the logical operation on the content of the variable in its internal storage pattern; you can convert the result with dec2bin if you want to see the resulting bit patterns.

>> bxor=bitxor(j,sc_o);
>> reshape(cellstr(dec2bin(bxor)),size(j))
ans =
  5×16 cell array
    {'11'}    {'10'}    {'11'}    {'10'}    {'10'}    {'01'}    {'11'}    {'10'}    {'10'}    {'01'}    {'00'}    {'00'}    {'01'}    {'11'}    {'00'}    {'01'}
    {'00'}    {'10'}    {'11'}    {'00'}    {'10'}    {'00'}    {'01'}    {'01'}    {'11'}    {'01'}    {'01'}    {'11'}    {'01'}    {'10'}    {'11'}    {'00'}
    {'11'}    {'01'}    {'01'}    {'11'}    {'01'}    {'00'}    {'00'}    {'11'}    {'01'}    {'01'}    {'10'}    {'10'}    {'01'}    {'11'}    {'01'}    {'10'}
    {'01'}    {'10'}    {'00'}    {'11'}    {'11'}    {'11'}    {'10'}    {'01'}    {'11'}    {'01'}    {'00'}    {'10'}    {'00'}    {'11'}    {'00'}    {'01'}
    {'11'}    {'01'}    {'01'}    {'10'}    {'10'}    {'10'}    {'11'}    {'11'}    {'10'}    {'00'}    {'10'}    {'00'}    {'01'}    {'01'}    {'11'}    {'10'}
>> 

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Ayesha Punjabi 2019-3-15

i think i might be doing something wrong pleae help

dpb 2019-3-15

编辑：dpb 2019-3-15

Yes, what you're doing wrong is using mat2str to turn the numeric values into strings first. DON'T DO THAT! :) Use the numeric values first to do the bit XOR() operation, THEN if you want to see the bit representation convert after the result has been computed. But, then you just need to apply dec2bin as I demonstrated.

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Answer 2

Adam Danz 2019-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/450113-how-to-perform-xor-of-two-bits-in-matab#answer_365421

编辑：Adam Danz 2019-3-14

在 MATLAB Online 中打开

Convert from char to logical matrices

jbin = (j + '0') == 97; 
sbin = (sc_o + '0') == 97; 

Now your data are size [80 x 2]

>> jbin(1:5,:)
ans =
  5×2 logical array
   0   0
   0   0
   1   0
   0   0
   1   1

If you want to perform xor element-wise,

xr = xor(jbin, sbin); %xr is a logical [80 x 2] matrix

If you want to perform xor row-wise,

xr = all((jbin + sbin) == 1,2); %xr is a logical [80 x 1] vector

Here's a look at the results of the row-wise line above. The left 2 columns are j and the right two columns are sc_o.

>> [jbin(xr,:), sbin(xr,:)]
ans = %Just the first 6 rows shown
  18×4 logical array
   0   0   1   1
   1   0   0   1
   1   1   0   0
   0   1   1   0
   0   0   1   1
   1   1   0   0