how can i find the numbers and their indices which are same

this is my data

1 3 4 36

3 2 2 5

5 5 6 8

3 4 1 23

3 12 6 34

1 5 3 1

11 17 12 9

17 19 26 26

16 1 1 27

18 10 18 15

i want to return those indices and their numbers which are repeating. for example row one has no repeating value so skip it.row 2, row 3 ,row 6, row 8 row 9 and 10 has the repeating numbers. so i want to obtain these numbers and their indices.

thanks in advance

Answer 1

[Stephen23]

M = [1,3,4,36;3,2,2,5;5,5,6,8;3,4,1,23;3,12,6,34;1,5,3,1;11,17,12,9;17,19,26,26;16,1,1,27;18,10,18,15];
for k = 1:size(M,1)
    V = M(k,:);
    [N,X] = histc(V,unique(V));
    F = find(N>1);
    Y = find(ismember(X,F)) % their column indices
    Z = V(Y)                % the repeated numbers
end

[Farman Shah]

thank you very much it worked.. just one thing. the variable Z contained only the last values i.e.18 18. how do i store all the same values in Z?

[Stephen23]

"how do i store all the same values in Z?"

Use a cell array to store the values:

M = [...];
N = size(M,1);
C = cell(1,N);
for k = 1:N
     ....
     Z = V(Y);
     C{k} = Z;
end

[Farman Shah]

thank you sir

[Farman Shah]

sir i would like to explore this topic ...if i ask another question whould you like to help me again. because you know my scenario.

[Stephen23]

Sure, please ask.

[Farman Shah]

now my question is : If i get the cell value as {2,2,8,8} it means i have same number of votes for both classes. in this case i want to sum the posterior probabilty of both the classes (which i have calculated and saved) . For example the posterior probability of first element of the cell is 0.30 and the second is 0.45 (sum is equal to 0.75). now i check the posterior probabiltiy of second class i.e. class 8. for example i found that the posterior probabilty of class 8 fisrt element is 0.60 and the second is 0.30 (sum is equal to 0.90). as the posterior probability of 8,8 is greather then the 2,2 now i want {2,2,8,8} returns me only 8,8 . how to do this?

any help will be really appriciated

thanks

i posted this question also. if you like to reply me here .please

or kindly you reply on my next post

Answer 2

[KSSV]

Read about unique. Run unique for each row.