find common elements of the same row

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Anuradha
Anuradha 2016-6-21
回答： Shameer Parmar 2016-6-21
hello, I need to find rows that have the same number in the same row eg (1 1).
  • s1 0 0 0 1 0 0 1
  • s2 1 0 0 0 0 1 0
How do I do that. I have an array of (40x1000) and I need to do that for every 2 columns and store the data in a separate file.
Thank you in advance

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Shameer Parmar
Shameer Parmar 2016-6-21
You can do this..
let us consider, you have following input matrix..
A = [1 2 3 4 5 6 7 8 9; 1 2 3 4 3 2 2 5 7; 9 8 7 6 5 4 3 2 1; 1 2 3 4 5 6 7 8 9; 1 2 3 4 3 2 2 5 7]
A =
1 2 3 4 5 6 7 8 9
1 2 3 4 3 2 2 5 7
9 8 7 6 5 4 3 2 1
1 2 3 4 5 6 7 8 9
1 2 3 4 3 2 2 5 7
% as you want to check same numbers in rows, so you need to check it row wise as follows..
count = 1;
for i = 1:size(A,1)
if length(A(i,:)) ~= length(unique(A(i,:)))
rowIndex(count) = i;
count = count + 1 ;
end
end
Output will be the new array, which will give you the row numbers (indices), which is having the same numbers in it..
Output:
rowIndex =
2 5

更多回答（2 个）

KSSV
KSSV 2016-6-21
doc unique.... by the way s1 0 0 0 1 0 0 1 have common [1 0]
Shameer Parmar
Shameer Parmar 2016-6-21
This is another Answer from my side..
If you have array of 40x1000, and all row and column contains 0's and 1's..
and you want to check if any row contains more than one 1's irrespective of 0's...then you can do this..
count = 1;
for i = 1:size(A,1)
if sum(A(i,:)) >= 2
rowIndex(count) = i;
count = count + 1 ;
end
end

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