# Pairwise comparison between four vectors

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nlm on 17 Oct 2018
Commented: nlm on 22 Oct 2018
I have 2 pairs of values i.e., 4 vectors, where two vectors within pair have equal length. Vector 1 = [0,1,2,5,6,8], Vector 2=[0,3,4,5,6,7] and Vector 3 =[0,1,2,3,6,8,3,2,4,5,6,8], and Vector 4 =[0,3,4,5,6,7,8,3,5,6,7,8]. Now I want to do pairwise comparison. for example (0,0) and (1,3) in pair 1 is same as (0,0) and (1,3) in pair 2. I have vectors of size 30,000 and 17,000. Any suggestions ?
I tried to use ismember and &&, it doesn't work.
for ii = 1:length(nr1)
if (nr == nr1(ii) || (nc ==nc1(ii)))
k = 1;
end
end
Jan on 18 Oct 2018
Edited: Jan on 18 Oct 2018
"It doesn't work" is a weak description of the problem. You do have the information already, so please share it with the readers.
" for example (0,0) and (1,3) in pair 1 is same as (0,0) and (1,3) in pair 2." - what does "is the same" mean exactly? Do only the values matter or even the position in the vectors? What do you want as output?

Jan on 18 Oct 2018
Edited: Jan on 18 Oct 2018
Vector1 = [0,1,2,5,6,8]
Vector2 = [0,3,4,5,6,7]
Vector3 = [0,1,2,3,6,8,3,2,4,5,6,8]
Vector4 = [0,3,4,5,6,7,8,3,5,6,7,8]
A = [Vector1(:), Vector2(:)];
B = [Vector3(:), Vector4(:)];
Result = A(ismember(A, B, 'rows'), :)
Result =
0 0
1 3
2 4
6 6
8 7
nlm on 22 Oct 2018
No, it worked thanks ! :)