getting the index after comparing two logicals

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cgo
cgo on 20 Jul 2022
Answered: Mathieu NOE on 20 Jul 2022
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

Answers (2)

DGM
DGM on 20 Jul 2022
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.

Mathieu NOE
Mathieu NOE on 20 Jul 2022
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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