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Combinations of different rows of a matrix

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Jess
Jess il 19 Giu 2019
Risposto: Stephen23 il 20 Giu 2019
I have a 90x2 matrix. I have to generate all combinations of 2 rows of the matrix. How can I do it?
Plz help

Risposta accettata

Stephen23
Stephen23 il 20 Giu 2019
Simpler using basic MATLAB indexing:
>> M = [1,5;6,2;5,6;7,5;9,0]
M =
1 5
6 2
5 6
7 5
9 0
>> X = nchoosek(1:size(M,1),2);
>> R = [M(X(:,1),:),M(X(:,2),:)]
R =
1 5 6 2
1 5 5 6
1 5 7 5
1 5 9 0
6 2 5 6
6 2 7 5
6 2 9 0
5 6 7 5
5 6 9 0
7 5 9 0

Più risposte (1)

Alex Mcaulley
Alex Mcaulley il 19 Giu 2019
A = rand(90,2); %Example
b = nchoosek(1:size(A,1),2);
res = reshape(cell2mat(arrayfun(@(i) A(b(i,:),:),1:size(b,1),'uni',0)),2,size(A,2),[]);
  4 Commenti
Jess
Jess il 19 Giu 2019
Sir
For example if I have a 5x2 matrix
1 5
6 2
5 6
7 5
9 0
Then my resultant matrix should be a 10 x 4 matrix with the following elements
1 5 1 5 (This should not come as it is repitition)
1 5 6 2
1 5 5 6
1 5 7 5
1 5 9 0
6 2 1 5 (This should not come as it is repitition)
6 2 6 2 (This should not come as it is repitition)
6 2 5 6
6 2 7 5
6 2 9 0
5 6 1 5 (This should not come as it is repitition)
5 6 6 2 (This should not come as it is repitition)
5 6 5 6 (This should not come as it is repitition)
5 6 7 5
5 6 9 0
7 5 1 5(This should not come as it is repitition)
7 5 6 2(This should not come as it is repitition)
7 5 5 6(This should not come as it is repitition)
7 5 7 5(This should not come as it is repitition)
7 5 9 0
9 0 1 5(This should not come as it is repitition)
9 0 6 2(This should not come as it is repitition)
9 0 5 6(This should not come as it is repitition)
9 0 7 5(This should not come as it is repitition)
9 0 9 0(This should not come as it is repitition)
Kindly help me with this
Jess
Jess il 20 Giu 2019
Sir for 90x2 matrix, how should we do it?
Should we type all the elements first
Plz help

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