# getting the index after comparing two logicals

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cgo 2022년 7월 20일
답변: Mathieu NOE 2022년 7월 20일
I compared two logicals and their results are as follows: a = [1 0 0 0 1] and b = [0 0 0 0 1]
1. I wanted to compare these logicals, identifying the corresponding columns where both 1's appear.
2. Identify which column that is: in this case, column 5.
Thanks

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### 답변 (2개)

DGM 2022년 7월 20일
Something like this:
a = [1 0 0 0 1];
b = [0 0 0 0 1];
idx = find(a & b)
idx = 5
Though depending on your needs, the usage of find() may be an unnecessary complication, as the intersection of the two vectors can likely be used for logical indexing just the same.
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Mathieu NOE 2022년 7월 20일
hello
see code below :
a = logical([1 0 0 0 1])
b = logical([0 0 0 0 1])
c = a & b
col_c_is_one = find(c)
gives the following results :
a = 1×5 logical array : 1 0 0 0 1
b = 1×5 logical array : 0 0 0 0 1
c = 1×5 logical array : 0 0 0 0 1
col_c_is_one = 5

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