Finding same values in uneven arrays

Hello,

I need help with finding true positives. A have an array with all the moments a certain event occurs. And I have an array with all the moments my algorithm detected the event. The arrays are not even lengths. For example:

Array 1 (always the same length):

3 4 5 6 7 20 21 22 23 24 25 26

Array 2 (can vary in length):

1 2 3 5 6 23 24 28 29 30 102 160 171 189 190

So I want the number I of times the arrays share the same number. In this case that will be 5 times, which means there are 5 true positives.

Can someone help me with this?

Thankyou in advance!!

Answer 1

[sloppydisk]

Use the ismember function.

A = [3 4 5 6 7 20 21 22 23 24 25 26];
B = [1 2 3 5 6 23 24 28 29 30 102 160 171 189 190];
positives = sum(ismember(A, B))

[Jens Keijser]

Thank you very much!