# Have one array follow another array with a threshhold

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Axel O on 24 Mar 2023
Commented: Axel O on 24 Mar 2023
Hi there! I've got two arrays and I want to put a threshhold on one of them and have the other array follow it (see example down below). After the threshhold is done, I'd like my array A1 follow the new A2, meaning that the first 3 values of A1 should be removed.
Any tips on how to do this?
A1 = [1 4 5 8 2 2 4];
A2 = [2 5 8 15 18 24 23]
A2Thresh = A2 < 10 | A2 > 30;
A2(A2Thresh) = [ ]

Dyuman Joshi on 24 Mar 2023
Edited: Dyuman Joshi on 24 Mar 2023
Use the same approach for A1 as well.
A1 = [1 4 5 8 2 2 4];
A2 = [2 5 8 15 18 24 23];
A2Thresh = A2 < 10 | A2 > 30;
A2(A2Thresh) = []
A2 = 1×4
15 18 24 23
A1(A2Thresh) = []
A1 = 1×4
8 2 2 4
Edit - This works only if both A1 and A2 have same size
Axel O on 24 Mar 2023
That did the trick! Thank you for all of your help, really appreciate it! I'll look into it more this weekend so I can avoid these issues in the future

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