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How to add two rows of binary elements of matrix in matlab ?

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Sagar Shriram Salwe
Sagar Shriram Salwe 2018-10-10
评论： Sagar Shriram Salwe 2018-10-11
Hello everyone, I want to add the binary matrix rows with the other. For example[1 0 1;1 1 0] i want to add these row and update in the matrix. Thanking you in advance
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Guillaume
Guillaume 2018-10-10
The binary sum of 110b and 010b is 1000b, not 100b, so I don't understand your final H.
Sagar Shriram Salwe
Sagar Shriram Salwe 2018-10-10
编辑：Sagar Shriram Salwe 2018-10-10
https://en.wikipedia.org/wiki/Low-density_parity-check_code
See in this example H they are adding rowwise and output is just the addition of that number element by element(Actually Avoiding the carry generated).

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采纳的回答

Guillaume
Guillaume 2018-10-10
Ok, you left out a lot of necessary information in your question. In particular, that your addition is performed in the 2 element galois field.
As stated on the wiki page, addition in GF(2) is simply a logical xor, so:
H(1, :) = xor(H(1, :), H(2, :))
Or you could use the features of the Communication System Toolbox (which I don't have) which fully support galois fields computation and has functions for error detection. It may even have your LDPC algorithm already implemented.
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Guillaume
Guillaume 2018-10-11
I'm afraid this is way outside my area of expertise. I learned this stuff 20 years ago and haven't used it since then.
Sagar Shriram Salwe
Sagar Shriram Salwe 2018-10-11
Actually while doing manually and adding the same quantities we are getting Null matrix. By multiplying G and Transpose of H and adding the elements by xor resolve this issue. In matlab for to do same any function is available or not?

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Adam Danz
Adam Danz 2018-10-10
编辑：Adam Danz 2018-10-10
Use bi2de() to convert the binary vectors to decimal; then add; then convert back to binary vector using de2bi(). These function are from communications toolbox.
H=[1 1 0;0 1 0]
bisum = de2bi(sum(bi2de(H)))
If you'd like to replace the first row of H with the new sum vector,
H(1,:) = de2bi(sum(bi2de(H)))
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Adam Danz
Adam Danz 2018-10-10
编辑：Adam Danz 2018-10-10
Yeah, this answer addresses adding binary matrix rows which was your original question prior to Guillaume looking into what you really wanted to do.
Sagar Shriram Salwe
Sagar Shriram Salwe 2018-10-10
Thank you!!! I Actually formulated as per the wiki page. It should be GF(2) addition i.e. xor operation.

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