How to make comparison between paired elements?

2014 6 19
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更新时间：2014 6 19
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Hi, I would like to compare pair of adjacent elements of array. For example:
if
A=[1;
2;
1;
3;
2;
4]
In this case the pairs are (1 2) (1 3) (2 4)... So in this case I have "unique" pairs.
But for example:
A=[1;
2;
1;
2;
2;
4]
In this case the pairs are (1 2) (1 2) (2 4) .... In this case I don't have "unique" pairs.
How can I make the comparisson of pairs, considering the pair is form with the adjacent element.
thanks

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Star Strider
Star Strider 2014-6-19

0 个投票

A=[1;
2;
1;
2;
2;
4]
Ar = reshape(A, 2, [])';
UA = unique(Ar,'rows')
The ‘UA’ matrix rows are the unique adjacent elements of your ‘A’ vector.

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Patty
Patty 2014-6-19
But, for example... If I have the matrix
A=[1;2;2;1;3;4]
The pairs are (1 2) (2 1) (3 4) .... In this case the first and second pair are considered the same because both has the same elements inside, it doesnt matter that is different position.
arich82
arich82 2014-6-19
Rehsape to Ar as shown, then sort your rows before applying unique:
A=[1;
2;
2;
1;
3;
4];
Ar = reshape(A, 2, [])';
Ars = sort(Ar, 2);
UA = unique(Ars,'rows')
Patty
Patty 2014-6-19
I got it using your suggestions... Thanks so much!.. Just a little change.
D=reshape(A,2,[]);
F=sum(D);
anyRepeated = length(unique(F) < length(F));
if anyRepeated<length(F)
passFlag2=0;
else
passFlag2=1;
end
I just copied here, in case somebody else needed.. :)
Star Strider
Star Strider 2014-6-19
My pleasure!
And thank you arich82.

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