hi,,,lets say I have a 3*4 matrix.. I want to add row-wise elements. How can I do that? TIA

example : A=[1 0 1 0 ; 0 1 0 0 ; 1 1 1 0];

How can I add the elements row wise?

Answer 1

[John BG]

bsxfun(@xor,A,A)

does not have index to point operation along a given matrix dimension, bsxfun(@xor,A,A,2) doesn't work.

However, for vertical xor you can do:

[sz1 sz2]=size(A)
B=xor(A(1,:),A(2,:));for k=2:1:sz1-1 B=xor(B,A(k+1,:));  end

and horizontal xor:

[sz1 sz2]=size(A)
B=xor(A(:,1),A(:,2));for k=2:1:sz2-1 B=xor(B,A(:,k+1));  end

1 is vertical, 2 is horizontal

Perhaps you are going to repeat these operations, you may want to turn these 2 into a single function with input the dimension to calculate xor along.

In case you don't know how to, just ask as comment in this question and I'll have a look.

If you find this answer of any help solving your question,

please click on the thumbs-up vote link,

thanks in advance

John

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[nafila aytija]

I am sorry but I do not know how to turn these 2 into a single function.All I am trying to do is to XOR along the 'rows' of matrix which actually gives a 1 bit result for each row...Again,thank you for answering...

[nafila aytija]

I am making it more clear .

Lets say my matrix is A=[1 0 1 0; 1 1 1 0]

It will give me the result as [0; 1]

[John BG]

a start point to develop the function you want could be the following:

function A_xor=auto_xor(A,n)
% n can be 1: xor horizontally, all columns
%       or 2: xor vertically, all rows

[sz1 sz2]=size(A);

switch n  
    case 2
        A_xor=xor(A(1,:),A(2,:));
        for k=2:1:sz1-1 
            A_xor=xor(A_xor,A(k+1,:));  
        end

      case 1
          A_xor=xor(A(:,1),A(:,2));
          for k=2:1:sz2-1 
                  A_xor=xor(A_xor,A(:,k+1));  
          end

      otherwise
          % display something with 'error' and break

end
end

it needs some work, to be a proper function that stands erroneous inputs, but hope it helps. Thanks for the points Regards

John

[e-mail]

[John BG]

to test the function, you may use

A=randi([0 1],randi([2 10],1,1),randi([2 10],1,1))

John

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