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Compare/match elements of 2 vector data

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Bundit Buddhahai
Bundit Buddhahai 2014-4-6
评论： Bundit Buddhahai 2014-4-9
I would like to compare/match elements of 2 vector data, the goal is to select the elements which element-wise from the 2 vectors are different not greater than 3. Then output are the 2 new vector with have the same length and its elements are arranged in order. The size of the 2 vectors (before processed) is arbitrary.
Ex. A = [11 38 49 84 96 117 157 176 200]
B = [10 28 37 48 84 157 175 200]
Compare by element which abs(A(i) - B(j)) <= 3 Then the output should be
A_new = [11 38 49 84 157 176 200]
B_new = [10 37 48 84 157 175 200]
Can anyone guide me how to write MATLAB code for this problem? I used 2 nested loop but got stuck with empty set fault.
Thank you.

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采纳的回答

Jos (10584)
Jos (10584) 2014-4-8
A = [11 38 49 84 96 117 157 176 200]
B = [10 28 37 48 84 157 175 200]
D = abs(bsxfun(@minus, A(:), B(:).')) % find difference of all combinations of A and B
[iA,iB] = find(D <= 3) % which combos meet the criterion
A_new = A(iA)
B_new = B(iB)
  1 个评论
Bundit Buddhahai
Bundit Buddhahai 2014-4-9
Hi Jos(10584), Many thanks for your advice. I got my output when using bsxfun. It's very useful function. Regards, Bundit

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更多回答（1 个）

Image Analyst
Image Analyst 2014-4-6
Seems ambiguous to me. What would you do in this case:
Ex. A = [11 38 39 84 96 117 157 176 200]
B = [10 28 37 48 84 157 175 200]
If the 38 moves to position 2 to be associated with the 38, then what does 39 get associated with? Is it compared to the 37, or with the 48 because the values "slide over."
What about these arrays:
Ex. A = [1 1 1 1 1 1 1]
B = [2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3]
  3 个评论
显示 1更早的评论
Image Analyst
Image Analyst 2014-4-7
Where did 49 come from? That was NOT in my example. Anyway, why not just do a pair of nested for loops?
Bundit Buddhahai
Bundit Buddhahai 2014-4-8
The third element of A is '49' not '39' (as shown in the first quote). Each adjacent element has different value more than 3.

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