Add two binary matrices and get only "1" in each row

Question

Ideth Kara 2020-9-22

0
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https://ww2.mathworks.cn/matlabcentral/answers/597949-add-two-binary-matrices-and-get-only-1-in-each-row

评论： Image Analyst 2020-9-22

Hello eveyone!

I have two binary matrices(m*n),i want to add those two matrices but in order to get only '1' in each row .

this is the output matrix ,for example in row (2,5,6 and 7) i have two '1' ,there is any solution to eliminate one of them ?

0 0 0 0 0

0 0 1 1 0

0 0 0 1 0

0 0 0 0 0

0 0 1 0 1

0 1 0 0 1

1 1 0 0 0

1 0 0 0 0

0 0 0 0 0

Would you please help me ?

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Image Analyst 2020-9-22

For the case (like rows 2 and 7) where the binary/logical matrices have 1's in different columns, which of the two 1's do you want to keep?

And are your matrices of class logical? Or class double? Or some integer class? It makes a difference!!!

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Answer 1

Ameer Hamza 2020-9-22

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https://ww2.mathworks.cn/matlabcentral/answers/597949-add-two-binary-matrices-and-get-only-1-in-each-row#answer_498547

编辑：Ameer Hamza 2020-9-22

在 MATLAB Online 中打开

This is one way

M = [ ...
     0     0     0     0     0
     0     0     1     1     0
     0     0     0     1     0
     0     0     0     0     0
     0     0     1     0     1
     0     1     0     0     1
     1     1     0     0     0
     1     0     0     0     0
     0     0     0     0     0
     0     0     0     0     0];
 
 M_out = M*0;
 [v, c] = max(M, [], 2);
 idx = sub2ind(size(M), find(v), c(v==1));
 M_out(idx) = 1;

Result

 >> M_out
M_out =
   0     0     0     0
   0     1     0     0
   0     0     1     0
   0     0     0     0
   0     1     0     0
   1     0     0     0
   0     0     0     0
   0     0     0     0
   0     0     0     0
   0     0     0     0