How to remove elements from two arrays when one of them has a zero

Hi everyone, I'll explain my problem.

I have two arrays of the same length which are called respectively: target_2019 and output_2019, what I am going to do is the difference between these two arrays and I calculate the MAPE. However, some of the values ​​present in target_2019 are zeros, how can I eliminate these zeros by simultaneously eliminating the measure that corresponds to this zero in the output_2019 array?

I hope I was clear.

Would anyone know how to help me?

[Konrad]

keepme = target_2019~=0;
target_2019 = target_2019(keepme);
output_2019 = output_2019(keepme);

[Giuseppe D'Amico]

thank you so much!

[Giuseppe D'Amico]

How can I calculate the MAPE? If I divide the two arrays, I get a matrix

Answer 1

[the cyclist]

idx_to_remove = target_2019==0;

target_2019(idx_to_remove) = [];
output_2019(idx_to_remove) = [];