How to compare each four rows by each other?

Question

Sarah A 2018-9-16

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https://ww2.mathworks.cn/matlabcentral/answers/419209-how-to-compare-each-four-rows-by-each-other

回答： Star Strider 2018-9-16

Hello,

Suppose we have 8 rows where each element in a row is either zero or one. I want to compare rows to count differences in this way:

row1 with row2 ; row1 with row 3; row1 with row4; row2 with rows 3; row2 with row4; row3 with row4.

So how can I do that in repetition manner to repeat doing that for row5,6,7, and 8 together. note that the number of different elements between any two rows should be stored in a matrix where in our case here we should have 6 rows in the differences matrix where each row store the number of differences between two rows in the main matrix.

Regards,

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Answer 1

Star Strider 2018-9-16

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https://ww2.mathworks.cn/matlabcentral/answers/419209-how-to-compare-each-four-rows-by-each-other#answer_337023

在 MATLAB Online 中打开

If you have the Statistics and Machine Learning Toolbox, use the pdist (link) function, specifying the 'hamming' distance measure:

data = randi([0 1], 8, 5)                               % Create Data
d = pdist(data, 'hamming');
DistancesP = squareform(d)                              % Percentage Differences
DistancesA = squareform(d) * size(data,2)               % Number Of Elements That Differ

produces:

data =
   1     1     1     0
   0     1     0     0
   0     1     0     0
   0     0     1     0
   1     1     1     1
   0     0     0     1
   0     1     1     1
   0     0     1     1
DistancesA =
   3     3     3     2     5     2     3
   0     0     2     3     2     3     4
   0     0     2     3     2     3     4
   2     2     0     3     2     3     2
   3     3     3     0     3     2     3
   2     2     2     3     0     3     2
   3     3     3     2     3     0     1
   4     4     2     3     2     1     0

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Answer 2

ahmed nebli 2018-9-16

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i prpose this algorithm: u define a variable m=4, and n=1, n is the number of the row, each time u search for your diffrences between rows (+-n), then n=n+1 and u compare rows (m-n) and n=n+1, and so on ... each time u store it in an external matrix A ( like u said), after that m=m+4 and u repeat the loop