Find elements of type (x,y) and indices for equality of columns x and y

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Torbjörn Olsson
Torbjörn Olsson 2020-11-4
评论： Torbjörn Olsson 2020-11-4
Find number of elements of type (x,y) in two columns, where x is in one column and y in the other. Report the indices for elements of type (x,y) that are equal.
Example a = [1,1,2,1]; b = [1,2,2,1]; should give answer (2,2) for index 3.

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回答（1 个）

Ameer Hamza
Ameer Hamza 2020-11-4
编辑：Ameer Hamza 2020-11-4
In case of given 'a' and 'b', same value occur in three rows
a = [1,1,2,1]; b = [1,2,2,1];
idx = find(a==b)
Result
>> idx
idx =
1 3 4
  1 个评论
Torbjörn Olsson
Torbjörn Olsson 2020-11-4
Yes but this should work for an arbitrarly sized array. The indices should just be counted if they occur at least two times. Above a=x and b=y.

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